动态SELECT TOP @var在SQL Server中

Question

如何设置动态变量来设置SQL Server中要返回的行数？以下是SQL Server 2005+中无效的语法:

DECLARE @count int
SET @count = 20

SELECT TOP @count * FROM SomeTable

Answer 1

SELECT TOP (@count) * FROM SomeTable

这仅适用于SQL 2005+

Answer 2

语法"select top(@var)..."仅适用于SQL SERVER 2005+.对于SQL 2000,您可以执行以下操作:

set rowcount @top

select * from sometable

set rowcount 0

希望这可以帮助

[287]莪.

(编辑用rowcount替换@@ rowcount - 感谢augustlights)

Answer 3

在x0n的例子中,它应该是:

SET ROWCOUNT @top

SELECT * from sometable

SET ROWCOUNT 0

Answer 4

declare @rows int = 10

select top (@rows) *
from Employees
order by 1 desc -- optional to get the last records using the first column of the table

Answer 5

或者你只是把变量放在括号里

DECLARE @top INT = 10;

SELECT TOP (@Top) *
FROM <table_name>;