In this post, we will explore some SQL query return data from multiple tables which we can perform using join in Mysql, and based on the common columns we can retrieve the data from multiple tables, So for the same we have taken an example below and performed the desired operation.
Return Data From Multiple Tables
Return data from Multiple tables is a MySQL concept where we draw some similarities between two or more tables that have something in common and have the same foreign key so here we will try to get the data from two or more two tables.
SELECT orders. order_ id, customers. customer_ name, orders. order_ date, order_ items. item_ name, order_ items. item_ quantity FROM orders INNER JOIN customers ON orders. customer_ id = customers. customer _id INNER JOIN order_ items ON orders. order_ id = order_ items. order_ id;
In this above example, we are selecting data from three tables: “orders”, “customers”, and “order_items”. We’re joining these tables based on their common columns: “customer_id” between “orders” and “customers”, and “order_id” between “orders” and “order_items”.
The SELECT statement selects the columns we want to retrieve from the tables. In this case, we’re selecting the order ID, customer name, order date, item name, and item quantity.
The INNER JOIN statement is used to combine the tables based on the common columns. We’re using two INNER JOINs to join the three tables together.
The result set will contain rows with data from all three tables, where the “customer_id” and “order_id” match between the tables.
You can modify the query to use other types of JOINs, or to retrieve data from more than two tables. Just make sure to join the tables based on their common columns and select the columns you want to retrieve from the tables.
Although we can also perform the same operation and task using some other method which is a subquery to retrieve data from one table and then use the result of the subquery as input for another query that retrieves data from another table. for the same we have given an example below:
SELECT customers. customer_ name, orders. order_ date, order_ items. item_ name, order_ items. item_ quantity FROM customers INNER JOIN orders ON customers. customer_id = orders. customer_ id INNER JOIN order_ items ON orders.order_ id = order_ items. order_ id WHERE orders. order_id IN (SELECT order_ id FROM order_ payments WHERE payment_ type = 'credit card');
It will also get the data from multiple tables like order, customers.
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