如何使用Sql Server 2008从表中删除前1000行？

我在SQL Server中有一个表。 我想从中删除前1000行。 不过，我试过这个，但是我不是只删除前1000行就删除了表中的所有行。

这里是代码：

delete from [mytab] select top 1000 a1,a2,a3 from [mytab] 

Answer 1

你试过的代码实际上是两个语句。 一个DELETE后跟一个SELECT 。

你没有按照什么命令来定义TOP 。

从CTE或类似的表格expression式删除特定的sorting标准是最有效的方法。

 ;WITH CTE AS ( SELECT TOP 1000 * FROM [mytab] ORDER BY a1 ) DELETE FROM CTE 

Answer 2

可能会更好的sql2005 +使用：

 DELETE TOP (1000) FROM [MyTab] WHERE YourConditions 

对于Sql2000：

 DELETE FROM [MyTab] WHERE YourIdField IN ( SELECT TOP 1000 YourIdField FROM [MyTab] WHERE YourConditions ) 

但

如果要删除特定子集的行而不是任意子集，则应明确指定子查询的顺序：

 DELETE FROM [MyTab] WHERE YourIdField IN ( SELECT TOP 1000 YourIdField FROM [MyTab] WHERE YourConditions ORDER BY ExplicitSortOrder ) 

感谢tp @ gbn提及并要求更加清楚准确的答案。

Answer 3

如下面的链接所定义的，您可以直接删除

 USE AdventureWorks2008R2; GO DELETE TOP (20) FROM Purchasing.PurchaseOrderDetail WHERE DueDate < '20020701'; GO 

http://technet.microsoft.com/en-us/library/ms175486(v=sql.105).aspx

Answer 4

 delete from [mytab] where [mytab].primarykeyid in ( select top 1000 primarykeyid from [mytab] ) 

Answer 5

它很快。 尝试一下：

 DELETE FROM YourTABLE FROM (SELECT TOP XX PK FROM YourTABLE) tbl WHERE YourTABLE.PK = tbl.PK 

用表名replaceYourTABLE ， XX用数字代替，例如1000， pk是表中主键字段的名称。

Answer 6

 SET ROWCOUNT 1000; DELETE FROM [MyTable] WHERE .....