COUNT ()

Синтаксис SQL COUNT()

SELECT COUNT() FROM table_name

SELECT COUNT(*) FROM table_name

SELECT COUNT( ) FROM table_name

- Зауваження: COUNT () работает в ORACLE и Microsoft SQL Server, но не в Microsoft Access.

Пример SQL COUNT()

Є наступна таблиця "Orders":

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SELECT COUNT(Customer) AS CustomerNilsen FROM Orders
WHERE Customer='Nilsen'

Приклад SQL COUNT (*)

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SELECT COUNT(*) AS NumberOfOrders FROM Orders

Пример SQL COUNT( )

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SELECT COUNT( Customer) AS NumberOfCustomers FROM Orders