{"id":56203,"date":"2016-07-29T16:09:04","date_gmt":"2016-07-29T16:09:04","guid":{"rendered":"http:\/\/webkul.com\/blog\/?p=56203"},"modified":"2026-02-05T06:58:12","modified_gmt":"2026-02-05T06:58:12","slug":"magento2-mysql-join-explained","status":"publish","type":"post","link":"https:\/\/webkul.com\/blog\/magento2-mysql-join-explained\/","title":{"rendered":"Magento 2 Mysql Join Explained In Detail"},"content":{"rendered":"\n
\"Magento-Code-Snippet-5-6\"<\/figure>\n\n\n\n

Here, we will learn Magento 2 mysql join queries, most of the time I see people having difficulty in using magento2 mysql join and results in writing bad code for database operations.<\/p>\n\n\n\n

We will see how to write join queries using Magento 2 ORM(Object Relational Mapping) methods.<\/p>\n\n\n\n

Below I have explained some of the queries by imagining that I have a model that which is connected to a table which schema is below :<\/p>\n\n\n\n

Column\tType\tComment\nentity_id\tint(11) Auto Increment\t primary key\nproduct_id\tint(11)\t product id\norder_id\tint(11)\t order id\ncustomer_id\tint(11)\t customer id\ntest_data       text<\/pre>\n\n\n\n
In the above table ‘my_table_join_test’ suppose we are saving product id, customer id and order id for some purpose, and want to get the information about product, order, and customer those id’s are present in our table generally, what people do they first write a query to get the data from ‘my_table_join_test’ table then they will write another query to get the data from Magento 2 product, order, or customer table to get desired data, which is wrong we can write a single join query to get all the data and create a proper collection, and it will also simlplify many issues that you have in creating admin grids where you want to show product, order or customer information, if you have not used join, grids filter and sorting will not work.<\/p>\n\n\n\n
Below is our model assuming module name is Stripe and company name is Webkul, create the model class at this location app\/code\/Webkul\/Stripe\/Model\/JoinModel.php :<\/p>\n\n\n\n
<?php\n\/**\n* model class to work with join\n*\/\nnamespace Webkul\\Stripe\\Model;\n\nuse Magento\\Framework\\DataObject\\IdentityInterface;\n\n\/**\n* JoinModel Model.\n*\/\nclass JoinModel extends \\Magento\\Framework\\Model\\AbstractModel\nimplements \\Webkul\\Stripe\\Api\\Data\\JoinModelInterface, IdentityInterface\n{\n\/**\n* No route page id.\n*\/\nconst NOROUTE_ENTITY_ID = 'no-route';\n\n\/**\n* Stripe JoinModel cache tag.\n*\/\nconst CACHE_TAG = 'my_table_join_test';\n\n\/**\n* @var string\n*\/\nprotected $_cacheTag = 'my_table_join_test';\n\n\/**\n* Prefix of model events names.\n*\n* @var string\n*\/\nprotected $_eventPrefix = 'my_table_join_test';\n\n\/**\n* Initialize resource model.\n*\/\nprotected function _construct()\n{\n$this->_init('Webkul\\Stripe\\Model\\ResourceModel\\JoinModel');\n}\n\n\/**\n* Load object data.\n*\n* @param int|null $id\n* @param string $field\n*\n* @return $this\n*\/\npublic function load($id, $field = null)\n{\nif ($id === null) {\nreturn $this->noRouteReasons();\n}\n\nreturn parent::load($id, $field);\n}\n\n\/**\n* Load No-Route JoinModel.\n*\n* @return \\Webkul\\Stripe\\Model\\JoinModel\n*\/\npublic function noRouteReasons()\n{\nreturn $this->load(self::NOROUTE_ENTITY_ID, $this->getIdFieldName());\n}\n\n\/**\n* Get identities.\n*\n* @return array\n*\/\npublic function getIdentities()\n{\nreturn [self::CACHE_TAG.'_'.$this->getId()];\n}\n\n\/**\n* Get ID.\n*\n* @return int\n*\/\npublic function getId()\n{\nreturn parent::getData(self::ENTITY_ID);\n}\n\n\/**\n* Set ID.\n*\n* @param int $id\n*\n* @return \\Webkul\\Stripe\\Api\\Data\\JoinModelInterface\n*\/\npublic function setId($id)\n{\nreturn $this->setData(self::ENTITY_ID, $id);\n}\n}<\/pre>\n\n\n\n
Now create resource model at app\/code\/Webkul\/Stripe\/Model\/ResourceModel\/JoinModel\/JoinModel.php:<\/p>\n\n\n\n
<?php\n\/**\n* Resource Model\n*\/\nnamespace Webkul\\Stripe\\Model\\ResourceModel;\n\n\/**\n* Stripe JoinModel ResourceModel.\n*\/\nclass JoinModel extends \\Magento\\Framework\\Model\\ResourceModel\\Db\\AbstractDb\n{\n\/**\n* Store model\n*\n* @var null|\\Magento\\Store\\Model\\Store\n*\/\nprotected $_store = null;\n\n\/**\n* Construct\n*\n* @param \\Magento\\Framework\\Model\\ResourceModel\\Db\\Context $context\n* @param string $connectionName\n*\/\npublic function __construct(\n\\Magento\\Framework\\Model\\ResourceModel\\Db\\Context $context,\n$connectionName = null\n)\n{\nparent::__construct($context, $connectionName);\n}\n\n\/**\n* Initialize resource model\n*\n* @return void\n*\/\nprotected function _construct()\n{\n$this->_init('my_table_join_test', 'entity_id');\n}\n\n\/**\n* Load an object using 'identifier' field if there's no field specified and value is not numeric\n*\n* @param \\Magento\\Framework\\Model\\AbstractModel $object\n* @param mixed $value\n* @param string $field\n* @return $this\n*\/\npublic function load(\\Magento\\Framework\\Model\\AbstractModel $object, $value, $field = null)\n{\nif (!is_numeric($value) && is_null($field)) {\n$field = 'identifier';\n}\n\nreturn parent::load($object, $value, $field);\n}\n\n\/**\n* Set store model\n*\n* @param \\Magento\\Store\\Model\\Store $store\n* @return $this\n*\/\npublic function setStore($store)\n{\n$this->_store = $store;\nreturn $this;\n}\n\n\/**\n* Retrieve store model\n*\n* @return \\Magento\\Store\\Model\\Store\n*\/\npublic function getStore()\n{\nreturn $this->_storeManager->getStore($this->_store);\n}\n}<\/pre>\n\n\n\n
now create collection class at app\/code\/Webkul\/Stripe\/Model\/ResourceModel\/JoinModel\/Collection.php:<\/p>\n\n\n\n
<?php\n\/**\n* join model collection\n*\/\n\nnamespace Webkul\\Stripe\\Model\\ResourceModel\\JoinModel;\n\nuse Magento\\Framework\\Model\\ResourceModel\\Db\\Collection\\AbstractCollection;\n\n\/**\n* Webkul Stripe ResourceModel JoinModel collection\n*\/\nclass Collection extends AbstractCollection\n{\n\/**\n* @var string\n*\/\nprotected $_idFieldName = 'entity_id';\n\n\/**\n* Store manager\n*\n* @var \\Magento\\Store\\Model\\StoreManagerInterface\n*\/\nprotected $_storeManager;\n\n\/**\n* @param \\Magento\\Framework\\Data\\Collection\\EntityFactoryInterface $entityFactory\n* @param \\Psr\\Log\\LoggerInterface $logger\n* @param \\Magento\\Framework\\Data\\Collection\\Db\\FetchStrategyInterface $fetchStrategy\n* @param \\Magento\\Framework\\Event\\ManagerInterface $eventManager\n* @param \\Magento\\Store\\Model\\StoreManagerInterface $storeManager\n* @param \\Magento\\Framework\\DB\\Adapter\\AdapterInterface|null $connection\n* @param \\Magento\\Framework\\Model\\ResourceModel\\Db\\AbstractDb|null $resource\n*\/\npublic function __construct(\n\\Magento\\Framework\\Data\\Collection\\EntityFactoryInterface $entityFactory,\n\\Psr\\Log\\LoggerInterface $logger,\n\\Magento\\Framework\\Data\\Collection\\Db\\FetchStrategyInterface $fetchStrategy,\n\\Magento\\Framework\\Event\\ManagerInterface $eventManager,\n\\Magento\\Store\\Model\\StoreManagerInterface $storeManager,\n\\Magento\\Framework\\DB\\Adapter\\AdapterInterface $connection = null,\n\\Magento\\Framework\\Model\\ResourceModel\\Db\\AbstractDb $resource = null\n)\n{\nparent::__construct($entityFactory, $logger, $fetchStrategy, $eventManager, $connection, $resource);\n$this->_storeManager = $storeManager;\n}\n\n\/**\n* Define resource model\n*\n* @return void\n*\/\nprotected function _construct()\n{\n$this->_init('Webkul\\Stripe\\Model\\JoinModel', 'Webkul\\Stripe\\Model\\ResourceModel\\JoinModel');\n$this->_map['fields']['entity_id'] = 'main_table.entity_id';\n}\n\/**\n* Add filter by store\n*\n* @param int|array|\\Magento\\Store\\Model\\Store $store\n* @param bool $withAdmin\n* @return $this\n*\/\npublic function addStoreFilter($store, $withAdmin = true)\n{\nif (!$this->getFlag('store_filter_added')) {\n$this->performAddStoreFilter($store, $withAdmin);\n}\nreturn $this;\n}\n}<\/pre>\n\n\n\n
Create api interface file at app\/code\/Webkul\/Stripe\/Api\/Data\/JoinModelInterface.php:<\/p>\n\n\n\n
<?php\n\/**\n* Join table data interface\n*\/\n\nnamespace Webkul\\Stripe\\Api\\Data;\n\n\/**\n* Stripe JoinModel interface.\n*\n* @api\n*\/\ninterface JoinModelInterface\n{\n\/**#@+\n* Constants for keys of data array. Identical to the name of the getter in snake case\n*\/\nconst ENTITY_ID = 'entity_id';\n\/**#@-*\/\n\n\/**\n* Get ID.\n*\n* @return int|null\n*\/\npublic function getId();\n\n\/**\n* Set ID.\n*\n* @param int $id\n*\n* @return \\Webkul\\Stripe\\Api\\Data\\ReasonsInterface\n*\/\npublic function setId($id);\n}<\/pre>\n\n\n\n
Your model is ready, we will see some join queries based on the above and magento 2 tables :<\/p>\n\n\n\n
Simple Inner Join<\/strong><\/p>\n\n\n\n
\/**\n         * $orderTable name of order table\n         *\/\n        $orderTable = $this->_resource->getTableName('sales_order');\n        \n        \/**\n         * $customerTable name of customer table\n         *\/\n        $customerTable = $this->_resource->getTableName('customer_entity');\n\n        \/**\n         * $joinCollection \n         * @var Webkul\\Stripe\\Model\\ResourceModel\\JoinModel\\CollectionFactory\n         *\/\n        $joinCollection = $this->_joinFactory->create();\n        $joinCollection\n        ->join(\n            ['ot'=>$orderTable],\n            "main_table.order_id = ot.entity_id"\n        );\n        \n        echo $joinCollection->getSelect();die;<\/pre>\n\n\n\n
In the above code we have called Magento 2 msql join function on our collection object which takes two parameters first one is an array with is used for table alias and second parameter is the condition at which it will join the tables, in the last I have printed the real sql query that is created, the output for above code is :<\/p>\n\n\n\n
SELECT `main_table`.*, `ot`.* FROM `wk_my_table_join_test` AS `main_table` INNER JOIN `wk_sales_order` AS `ot` ON main_table.order_id = ot.entity_id<\/pre>\n\n\n\n
You can run this query in the mysql and check the output.<\/p>\n\n\n\n
Left Join<\/strong><\/p>\n\n\n\n
   \/**\n         * $orderTable name of order table\n         *\/\n        $orderTable = $this->_resource->getTableName('sales_order');\n        \n        \/**\n         * $customerTable name of customer table\n         *\/\n        $customerTable = $this->_resource->getTableName('customer_entity');\n\n        \/**\n         * $joinCollection \n         * @var Webkul\\Stripe\\Model\\ResourceModel\\JoinModel\\CollectionFactory\n         *\/\n        $joinCollection = $this->_joinFactory->create();\n        $joinCollection\n        ->getSelect()\n        ->joinLeft(\n            ['ot'=>$orderTable],\n            "main_table.order_id = ot.entity_id"\n        );\n        \n        echo $joinCollection->getSelect();die;<\/pre>\n\n\n\n
The above code simple for left join just use joinLeft method and rest will be the same, left join is used to return all the rows from the left table and matched rows from right table and will set unmatched data to null.<\/p>\n\n\n\n
Now we have seen how to create simple join queries, the above queries will fetch all the columns from both the tables. Now we will see how to get selected columns :<\/p>\n\n\n\n
       \/**\n         * $orderTable name of order table\n         *\/\n        $orderTable = $this->_resource->getTableName('sales_order');\n        \n        \/**\n         * $customerTable name of customer table\n         *\/\n        $customerTable = $this->_resource->getTableName('customer_entity');\n\n        \/**\n         * $joinCollection \n         * @var Webkul\\Stripe\\Model\\ResourceModel\\JoinModel\\CollectionFactory\n         *\/\n        $joinCollection = $this->_joinFactory->create();\n        $joinCollection\n        ->getSelect()\n        ->join(\n            ['ot'=>$orderTable],\n            "main_table.order_id = ot.entity_id",\n            [\n                'increment_id' => 'ot.increment_id'\n            ]\n        );\n        \n        echo $joinCollection->getSelect();die;<\/pre>\n\n\n\n
The above code will result is this query :<\/p>\n\n\n\n
SELECT `main_table`.*, `ot`.`increment_id` FROM `wk_my_table_join_test` AS `main_table` INNER JOIN `wk_sales_order` AS `ot` ON main_table.order_id = ot.entity_id<\/pre>\n\n\n\n
When you will run the above query, it will return all the columns from the main table and only increment_id from order table because we have passed only one column in the third parameter of join function you can pass as many columns as you want .<\/p>\n\n\n\n
Now we will see how to create conditions or where clause on the join result :<\/p>\n\n\n\n
Use Where Clause:<\/strong><\/p>\n\n\n\n
       \/**\n         * $orderTable name of order table\n         *\/\n        $orderTable = $this->_resource->getTableName('sales_order');\n        \n        \/**\n         * $customerTable name of customer table\n         *\/\n        $customerTable = $this->_resource->getTableName('customer_entity');\n\n        \/**\n         * $joinCollection \n         * @var Webkul\\Stripe\\Model\\ResourceModel\\JoinModel\\CollectionFactory\n         *\/\n        $joinCollection = $this->_joinFactory->create();\n        $joinCollection\n        ->getSelect()\n        ->join(\n            ['ot'=>$orderTable],\n            "main_table.order_id = ot.entity_id",\n            [\n                'increment_id' => 'ot.increment_id',\n                'status' => 'ot.state'\n            ]\n        )\n        ->where("status = 'pending'");\n        \n        echo $joinCollection->getSelect();die;<\/pre>\n\n\n\n
The above code will result in this query :<\/p>\n\n\n\n
SELECT `main_table`.*, `ot`.`increment_id`, `ot`.`state` AS `status` FROM `wk_my_table_join_test` AS `main_table` INNER JOIN `wk_sales_order` AS `ot` ON main_table.order_id = ot.entity_id WHERE (status = 'pending')<\/pre>\n\n\n\n

in the above code for adding where clause we just called the where method on joined collection which accepts one parameter string .<\/p>\n\n\n\n
Now we will see how to use aggregate function like GROUP_CONCAT , COUNT etc :<\/p>\n\n\n\n
        \/**\n         * $orderTable name of order table\n         *\/\n        $orderTable = $this->_resource->getTableName('sales_order');\n        \n        \/**\n         * $customerTable name of customer table\n         *\/\n        $customerTable = $this->_resource->getTableName('customer_entity');\n\n        \/**\n         * $joinCollection \n         * @var Webkul\\Stripe\\Model\\ResourceModel\\JoinModel\\CollectionFactory\n         *\/\n        $joinCollection = $this->_joinFactory->create();\n        $joinCollection\n        ->getSelect()\n        ->join(\n            ['ot'=>$orderTable],\n            "main_table.order_id = ot.entity_id",\n            [\n                'increment_id' => 'ot.increment_id',\n                'status' => 'GROUP_CONCAT(ot.state)'\n            ]\n        )\n        ->where("status = 'pending'")\n        ->group("main_table.order_id");\n        \n        echo $joinCollection->getSelect();die;<\/pre>\n\n\n\n
In the above code I have used group function which accepts one parameter as string. You can pass multiple columns as comma separated. I have used GROUP_CONCAT  aggregate function on column  ‘status’ and grouped the result on ‘order_id’ column. The above code will result in this query :<\/p>\n\n\n\n
SELECT `main_table`.*, `ot`.`increment_id`, GROUP_CONCAT(ot.state) AS `status` FROM `wk_my_table_join_test` AS `main_table` INNER JOIN `wk_sales_order` AS `ot` ON main_table.order_id = ot.entity_id WHERE (status = 'pending') GROUP BY `main_table`.`order_id`<\/pre>\n\n\n\n
The above query will result combining all the same order_id in one row. And will concat all the order statuses in one column as comma separated. If you want to combine distinct values use below code :<\/p>\n\n\n\n
        \/**\n         * $orderTable name of order table\n         *\/\n        $orderTable = $this->_resource->getTableName('sales_order');\n        \n        \/**\n         * $customerTable name of customer table\n         *\/\n        $customerTable = $this->_resource->getTableName('customer_entity');\n\n        \/**\n         * $joinCollection \n         * @var Webkul\\Stripe\\Model\\ResourceModel\\JoinModel\\CollectionFactory\n         *\/\n        $joinCollection = $this->_joinFactory->create();\n        $joinCollection\n        ->getSelect()\n        ->join(\n            ['ot'=>$orderTable],\n            "main_table.order_id = ot.entity_id",\n            [\n                'increment_id' => 'ot.increment_id',\n                'status' => 'GROUP_CONCAT(DISTINCT ot.state)'\n            ]\n        )\n        ->where("status = 'pending'")\n        ->group("main_table.order_id");\n        \n        echo $joinCollection->getSelect();die;<\/pre>\n\n\n\n
Let’s look at the one last example of join multiple tables :<\/p>\n\n\n\n
\/**\n         * $orderTable name of order table\n         *\/\n        $orderTable = $this->_resource->getTableName('sales_order');\n        \n        \/**\n         * $customerTable name of customer table\n         *\/\n        $customerTable = $this->_resource->getTableName('customer_entity');\n\n        \/**\n         * $joinCollection \n         * @var Webkul\\Stripe\\Model\\ResourceModel\\JoinModel\\CollectionFactory\n         *\/\n        $joinCollection = $this->_joinFactory->create();\n        $joinCollection\n        ->getSelect()\n        ->join(\n            ['ot'=>$orderTable],\n            "main_table.order_id = ot.entity_id",\n            [\n                'increment_id' => 'ot.increment_id',\n                'status' => 'GROUP_CONCAT(DISTINCT ot.state)'\n            ]\n        )\n        ->join(\n            ['ct' => $customerTable],\n            "main_table.customer_id = ct.entity_id",\n            [\n                "customer_name" => "ct.firstname"\n            ]\n        )\n        ->group("main_table.order_id");\n        \n        echo $joinCollection->getSelect();die;<\/pre>\n\n\n\n
In the code above, we created the another join to the customer table to fetch the customer’s first name. And the above code will output with this query:<\/p>\n\n\n\n
SELECT `main_table`.*, `ot`.`increment_id`, GROUP_CONCAT(DISTINCT ot.state) AS `status`, `ct`.`firstname` AS `customer_name` FROM `wk_my_table_join_test` AS `main_table` INNER JOIN `wk_sales_order` AS `ot` ON main_table.order_id = ot.entity_id INNER JOIN `wk_customer_entity` AS `ct` ON main_table.customer_id = ct.entity_id GROUP BY `main_table`.`order_id`<\/pre>\n\n\n\n
Hope this will help you in understanding how to write code for join queries in Magento 2. Try the code above and in case you are not able to understand anything above please comment below.<\/p>\n\n\n\n
You may also check our quality Magento 2 Extensions<\/a>.<\/p>\n\n\n\n
Thanks \ud83d\ude42 .<\/p>\n","protected":false},"excerpt":{"rendered":"
Here, we will learn Magento 2 mysql join queries, most of the time I see people having difficulty in using magento2 mysql join and results in writing bad code for database operations. We will see how to write join queries using Magento 2 ORM(Object Relational Mapping) methods. Below I have explained some of the queries […]<\/a><\/p>\n","protected":false},"author":33,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[302,1],"tags":[],"class_list":["post-56203","post","type-post","status-publish","format-standard","hentry","category-magento2","category-uncategorized"],"yoast_head":"\nMagento 2 Mysql Join Explained In Detail - Webkul Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/webkul.com\/blog\/magento2-mysql-join-explained\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Magento 2 Mysql Join Explained In Detail - Webkul Blog\" \/>\n<meta property=\"og:description\" content=\"Here, we will learn Magento 2 mysql join queries, most of the time I see people having difficulty in using magento2 mysql join and results in writing bad code for database operations. We will see how to write join queries using Magento 2 ORM(Object Relational Mapping) methods. 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