sql server 2005下奇怪的Delete Top 语句(downmoon)
sql server 2005中Delete语句可以添加一个top参数
以下示例删除 Testdb 表中所有行的 10%。
--生成测试数据库
Create database Testdb
go
USE [Testdb]
GO
--生成测试表
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[TestDelete](
[PKID] [int] IDENTITY(1,1) NOT NULL,
[TestID] [int] NULL,
[testString] [nvarchar](50) NULL,
CONSTRAINT [PK_TestDelere] PRIMARY KEY CLUSTERED
(
[PKID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
go
--插入测试数据
declare @tmpID int
set @tmpID=1
WHILE ( (SELECT max(PKID) FROM TestDelete)<2000 )
BEGIN
set @tmpID=@tmpID+2
insert into [TestDelete] ([TestID],[testString]) values(@tmpID,cast(@tmpID as nvarchar(10)))
CONTINUE
END
select count(*) from TestDelete
go
--删除测试数据
--以下示例删除 Testdb 表中所有行的 10%。
DELETE TOP (10) PERCENT FROM TestDelete
GO
--下面这句执行错误
----DELETE TOP (10) PERCENT FROM TestDelete order by PKID desc
----GO
select count(*) from TestDelete
go
--删除测试数据库
----drop database Testdb
----go
以下示例删除 Testdb 表中所有行的 10%。
--生成测试数据库Create database TestdbgoUSE [Testdb]GO--生成测试表SET ANSI_NULLS ONGOSET QUOTED_IDENTIFIER ONGOCREATE TABLE [dbo].[TestDelete]( [PKID] [int] IDENTITY(1,1) NOT NULL, [TestID] [int] NULL, [testString] [nvarchar](50) NULL, CONSTRAINT [PK_TestDelere] PRIMARY KEY CLUSTERED ( [PKID] ASC)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY]go--插入测试数据declare @tmpID int set @tmpID=1WHILE ( (SELECT max(PKID) FROM TestDelete)<2000 )BEGIN set @tmpID=@tmpID+2 insert into [TestDelete] ([TestID],[testString]) values(@tmpID,cast(@tmpID as nvarchar(10))) CONTINUEENDselect count(*) from TestDeletego--删除测试数据--以下示例删除 Testdb 表中所有行的 10%。
DELETE TOP (10) PERCENT FROM TestDeleteGO--下面这句执行错误----DELETE TOP (10) PERCENT FROM TestDelete order by PKID desc ----GOselect count(*) from TestDeletego--删除测试数据库----drop database Testdb----go来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/16436858/viewspace-612106/ ，如需转载，请注明出处，否则将追究法律责任。
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