| MySQL

SELECT column_name, (column_name)
FROM table_name
WHERE  
 column_name

Пример SQL

O_Id	OrderDate	OrderPrice	Customer
1	2008/11/12	1000	Hansen
2	2008/10/23	1600	Nilsen
3	2008/09/02	700	Hansen
4	2008/09/03	300	Hansen
5	2008/08/30	2000	Jensen
6	2008/10/04	100	Nilsen

1 2	SELECT Customer, (OrderPrice) FROM Orders Customer

Query Result:

Теперь давайте посмотрим, что произойдет, если мы не используем запрос :

1	SELECT Customer, (OrderPrice) FROM Orders

Query Result:

1 2	SELECT Customer,OrderDate, (OrderPrice) FROM Orders Customer,OrderDate

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