Codeigniter Left Outer Join Example

Introduction

Here I am going to show CodeIgniter left outer join example. I will use CodeIgniter’s Query Builder Class to build left outer or left join queries for fetching data from multiple tables. The purpose of a join is to combine the data across tables.

A join is actually performed by the where clause which combines the specified rows of tables. If a join involves in more than two tables then first two tables are joined based on the join condition and then compares the result with the next table and so on.

Outer join gives the non-matching records along with matching records. Left Outer Join will display the all matching records and the records which are in left hand side table those that are not in right hand side table.

I will use CodeIgniter’s $this->db->join() that permits you to write the join portion of your query.

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Prerequisites

Apache HTTP Server 2.4, PHP 7.4.3, CodeIgniter 3.1.11, MySQL 8.0.17

MySQL Tables

Here I am going to create following tables in MySQL server under roytuts database.

CREATE TABLE `blogs` (
  `blog_id` int unsigned NOT NULL AUTO_INCREMENT,
  `blog_title` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL,
  `blog_content` text COLLATE utf8mb4_unicode_ci NOT NULL,
  `blog_date` datetime NOT NULL,
  PRIMARY KEY (`blog_id`)
) ENGINE=InnoDB AUTO_INCREMENT=45 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE `blog_comments` (
  `comment_id` int unsigned NOT NULL AUTO_INCREMENT,
  `comment_text` text COLLATE utf8mb4_unicode_ci NOT NULL,
  `comment_date` datetime NOT NULL,
  `parent_id` int unsigned NOT NULL DEFAULT 0,
  `blog_id` int unsigned NOT NULL DEFAULT 0,
  PRIMARY KEY (`comment_id`)
) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

Now I am also going to store some sample data into above tables for testing the application.

insert  into `blogs`(`blog_id`,`blog_title`,`blog_content`,`blog_date`) values (4,'Sample Blog','Sample Blog Content','2016-05-21 18:24:13'),(5,'Sample Blog','Sample Blog Content','2016-05-21 18:24:13'),(6,'Sample Blog','Sample Blog Content','2016-05-21 18:24:13'),(7,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 08:09:26'),(8,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 00:00:00'),(9,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:58:55'),(10,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:01'),(11,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:02'),(12,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:02'),(13,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:02'),(14,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:03'),(15,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:03'),(16,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:03'),(17,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:03'),(18,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:03'),(19,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:03'),(20,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:04'),(21,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:04'),(22,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:04'),(23,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:04'),(24,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:04'),(25,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:04'),(26,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:05'),(27,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:05'),(28,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:05'),(29,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:05'),(30,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:05'),(31,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:05'),(32,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:06'),(33,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:06'),(34,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:06'),(35,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:06'),(36,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:06'),(37,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:07'),(38,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:07'),(39,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:07'),(40,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:07'),(41,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:07'),(42,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:07'),(43,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:08'),(44,'Sample Blog','Muffin gummi bears tiramisu pudding pudding halvah oat cake cake. Topping sugar plum tootsie roll tart chocolate bar biscuit pudding. Candy canes chocolate cake powder pastry carrot cake. Jelly-o apple pie icing bear claw oat cake muffin pie. Cake dragée pie. Toffee apple pie candy. Candy cheesecake carrot cake liquorice tootsie roll jelly biscuit applicake. Soufflé jelly beans croissant jelly-o danish liquorice. Cheesecake cotton candy gummi bears cookie bear claw applicake tiramisu gummies bear claw. Icing candy canes bear claw macaroon ice cream jujubes applicake chocolate gingerbread. Topping tootsie roll sweet. Halvah dessert cookie pie jelly beans gummies jelly beans danish. Soufflé caramels tootsie roll croissant halvah. Bonbon cotton candy sweet cake oat cake wafer applicake.','2016-05-25 20:59:08');

insert  into `blog_comments`(`comment_id`,`comment_text`,`comment_date`,`parent_id`,`blog_id`) values (1,'good one','2016-05-28 07:30:46',0,4),(2,'nice','2016-05-27 07:34:28',0,5),(3,'great','2016-05-26 07:35:03',0,6),(4,'carry on','2016-05-28 07:35:23',0,7),(5,'good tuts','2016-05-28 07:35:42',0,4),(6,'like it','2016-05-28 07:36:00',0,5),(7,'waiting for next post','2016-05-28 07:36:25',0,9);

Left Outer Join Example

Here we will see an example how to create a left outer join query to fetch data from MySQL table.

On executing below query:

SELECT blogs.blog_id,comment_id,blog_title,blog_content,blog_date,comment_text,comment_date
 FROM blogs LEFT OUTER JOIN blog_comments ON blog_comments.blog_id = blogs.blog_id;

Or

SELECT blogs.blog_id,comment_id,blog_title,blog_content,blog_date,comment_text,comment_date
 FROM blogs LEFT JOIN blog_comments ON blog_comments.blog_id = blogs.blog_id;

We will get below results from the above two tables. The output has total 44 rows:

codeigniter left outer join

Project Directory

It’s assumed that you have setup Apache, PHP and Codeigniter in Windows system.

Now I will create a project root directory called codeIgniter-left-outer-join under the Apache server’s htdocs folder.

Now move all the directories and files from CodeIgniter framework into codeIgniter-left-outer-join directory.

I may not mention the project root directory in subsequent sections and I will assume that I am talking with respect to the project’s root directory.

Configuring Database

Configure your MySQL database to work with your CodeIgniter application. I will configure database connection into application/config/database.php file. Please make sure to change values according to your database settings.

$db['default'] = array(
	'dsn'	=> '',
	'hostname' => 'localhost',
	'username' => 'root',
	'password' => 'root',
	'database' => 'roytuts',
        ...
	'char_set' => 'utf8mb4',
	'dbcollat' => 'utf8mb4_unicode_ci',
        ...
);

Configuring Auto-load

We will configure database library and helpers to auto-load to avoid load every time we need to use such things in the application.

Update the below lines in the file application/config/autoload.php.

$autoload['libraries'] = array('database');
$autoload['helper'] = array('url', 'file');

Model Class

I will perform database operation to fetch data using left outer join query so I will create model class.

I will use CodeIgniter’s Query builder class to build the left outer join query.

Create a file LeftJoinModel.php under application/models folder with the below source code.

<?php

/**
 * Description of LeftJoinModel
 *
 * @author https://www.roytuts.com
 */
class LeftJoinModel extends CI_Model {

    private $blogs = 'blogs';   // blog table
    private $blog_comments = 'blog_comments';   // blog comment table

    function __construct() {
        parent::__construct();
    }

    function left_outer_join() {
        $this->db->select($this->blogs . '.blog_id,comment_id,blog_title,blog_content,blog_date,comment_text,comment_date');
        $this->db->from($this->blogs);
        //third parameter indicates left outer join
        $this->db->join($this->blog_comments, $this->blog_comments . '.blog_id = ' . $this->blogs . '.blog_id', 'left outer');
        $query = $this->db->get();
        return $query->result();
    }

}

Controller Class

I will create controller class to handle request/response for clients. This controller class will communicate between model class and the view file.

Create a file LeftJoinController.php under application/controllers folder with below source code.

<?php

defined('BASEPATH') OR exit('No direct script access allowed');

class LeftJoinController extends CI_Controller {
	
	function __construct() {
        parent::__construct();
        $this->load->model('leftjoinmodel');
    }
	
	public function index()	{
		$data['blogs'] = $this->leftjoinmodel->left_outer_join();
        $this->load->view('left_join_view', $data);
	}
}

View File

Create a view file left_join_view.php under application/views which will be used to display blogs and associated comments for blogs.

<?php
defined('BASEPATH') OR exit('No direct script access allowed');
?><!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="utf-8">
	<title>Welcome to CodeIgniter Left Outer Join Example</title>

	<style type="text/css">

	::selection { background-color: #E13300; color: white; }
	::-moz-selection { background-color: #E13300; color: white; }

	body {
		background-color: #fff;
		margin: 40px;
		font: 13px/20px normal Helvetica, Arial, sans-serif;
		color: #4F5155;
	}

	a {
		color: #003399;
		background-color: transparent;
		font-weight: normal;
	}

	h1 {
		color: #444;
		background-color: transparent;
		border-bottom: 1px solid #D0D0D0;
		font-size: 19px;
		font-weight: normal;
		margin: 0 0 14px 0;
		padding: 14px 15px 10px 15px;
	}

	code {
		font-family: Consolas, Monaco, Courier New, Courier, monospace;
		font-size: 12px;
		background-color: #f9f9f9;
		border: 1px solid #D0D0D0;
		color: #002166;
		display: block;
		margin: 14px 0 14px 0;
		padding: 12px 10px 12px 10px;
	}

	#body {
		margin: 0 15px 0 15px;
	}

	p.footer {
		text-align: right;
		font-size: 11px;
		border-top: 1px solid #D0D0D0;
		line-height: 32px;
		padding: 0 10px 0 10px;
		margin: 20px 0 0 0;
	}

	#container {
		margin: 10px;
		border: 1px solid #D0D0D0;
		box-shadow: 0 0 8px #D0D0D0;
	}
	</style>
</head>
<body>

<div id="container">
	<h1>CodeIgniter Left Outer Join Example</h1>            
	<div id="body">
		<?php
		foreach ($blogs as $blog) {
			?>
			<div class="post">
				<h2 class="title"><?php echo $blog->blog_title; ?></h2>
				<p class="meta">
					<?php
					echo $blog->blog_date;
					?>
				<div class="entry">
					<p><?php echo $blog->blog_content; ?></p>
				</div>
			</div>
		<p>    <strong>Comment on <?php echo $blog->comment_date; ?> :</strong> <?php echo $blog->comment_text; ?></p>
			<?php
		}
		?>
	</div>
</div>

</body>
</html>

Configuring Route

Now modify application/config/routes.php file for configuring route with our controller class.

$route['default_controller'] = 'LeftJoinController';

Testing the Application

Make sure your Apache server is running and Codeigniter join application is deployed.

Hit the URL http://localhost/codeIgniter-left-outer-join/index.php, you will see below output on the browser:

In the above output image for few blogs you will see comment date and for other blogs you will not see any comment dates because in left outer join all records from left table and matching records from right table are fetched.

Source Code

Download source code

Thanks for reading.

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