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SQL INNER JOIN Keyword

SQL INNER JOIN Keyword

The INNER JOIN keyword return rows when there is at least one match in both tables.

SQL INNER JOIN Syntax

SELECT column_name(s)

FROM table_name1

INNER JOIN table_name2

ON table_name1.column_name=table_name2.column_name

PS: INNER JOIN is the same as JOIN.

SQL INNER JOIN Example

The "Persons" table:

P_ I d Last Nam e Fi r st Nam e Addr ess Ci t y

1 Hansen Ola Timoteivn 10 Sandnes

2 Svendson Tove Borgvn 23 Sandnes

3 Pettersen Kari Storgt 20 Stavanger

The "Orders" table:

O_I d Or der No P_ I d

1 77895 3

2 44678 3

3 22456 1

4 24562 1

5 34764 15

Now we want to list all the persons with any orders.

We use the following SELECT statement:

SELECT Persons.LastName, Persons.FirstName, Orders.OrderNo

FROM Persons

INNER JOIN Orders

ON Persons.P_Id=Orders.P_Id

ORDER BY Persons.LastName

The result-set will look like this:

Last Nam e Fi r st Nam e Or d er NoHansen Ola 22456

Hansen Ola 24562

Pettersen Kari 77895

Pettersen Kari 44678

The INNER JOIN keyword return rows when there is at least one match in both tables. If there are rows

in "Persons" that do not have matches in "Orders", those rows will NOT be listed.

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L INNER JOIN Keyword http://www.w3schools.com/sql/sql_join_inner.asp

2 03/09/2012 16:04

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L INNER JOIN Keyword http://www.w3schools.com/sql/sql_join_inner.asp

2 03/09/2012 16:04