SQL INNER JOIN Keyword: Main Tips
- The INNER JOIN keyword selects the pair tables rows if there is a match between in two tables columns.
- INNER JOIN acts the same as JOIN.
Syntax of SQL INNER JOIN
Selects information that has matching values in both tables.
SELECT column_name(s) FROM mytable1 INNER JOIN mytable2 ON mytable1.column_name = mytable2.column_name;
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This is demo example from the "Developers" table in the database:
|1||Tom Kurkutis||New York||USA|
This is demo example from the "Orders" table in the database:
SQL INNER JOIN: Examples
The next SQL statement will return all developers with orders:
SELECT Orders.ID, Developers.Name FROM Orders INNER JOIN Developers ON Orders.ID = Developers.ID;
Note: the columns are matching, the INNER JOIN keyword selects the two tables rows. Customers will NOT be listed, if there is a difference between the rows.
In this example we JOIN three tables: select all orders with developer and client information:
SELECT Orders.ID, Developers.Name, Customers.Name FROM ((Orders INNER JOIN Developers ON Orders.ID = Developers.ID) INNER JOIN Customers ON Orders.ID = Customers.ID);
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