Learn about the SQL INNER JOIN keyword

SQL INNER JOIN keyword is very important in php, so this article will introduce its related knowledge in detail.

The INNER JOIN keyword returns rows when there is at least one match in the table.

INNER JOIN keyword syntax

SELECT column_name(s)
FROM table_name1
INNER JOIN table_name2 
ON table_name1.column_name=table_name2.column_name

Note: INNER JOIN is the same as JOIN

Inner connection（INNER JOIN )Example

Now, we want to list everyone's orders.

You can use the following SELECT statement:

SELECT Persons.LastName, Persons.FirstName, Orders.OrderNo
FROM Persons
INNER JOIN Orders
ON Persons.Id_P=Orders.Id_P
ORDER BY Persons.LastName

This article provides a relevant introduction to the join keyword. For more learning materials, please pay attention to the php Chinese website.

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