日期:2014-05-18  浏览次数:20397 次

符合某一条件的数据,全部在本本表复制一份,改动一个标识
例如

taba 
表结果
id name eat
 1 tom ok
2 rose no


将所有no 的复制一份 新复制的no改为yes

结果
id name eat
1 tom ok
2 rose yes
3 rose ok




最好是两种方式实现 1 直接用语句 2,用触发器 实现 ,sql2000

谢谢

------解决方案--------------------
SQL code
--> 测试数据:[tb]
IF OBJECT_ID('[tb]') IS NOT NULL DROP TABLE [tb]
GO 
CREATE TABLE [tb]([id] INT,[name] VARCHAR(4),[eat] VARCHAR(2))
INSERT [tb]
SELECT 1,'tom','ok' UNION ALL
SELECT 2,'rose','no'
--------------开始查询--------------------------

SELECT id=ROW_NUMBER() OVER(ORDER BY id),[name],[eat]
FROM
(
SELECT * FROM [tb]
UNION ALL 
SELECT [id],[name],'ok'FROM [tb] WHERE [eat]='no'
) AS t
----------------结果----------------------------
/* 
-------------------- ---- ----
1                    tom  ok
2                    rose no
3                    rose ok

(3 行受影响)


*/

------解决方案--------------------
SQL code
--sql 2000:先插入后更新
begin tran
insert into taba select name,'ok' from taba where eat='no'
update taba set eat='yes' where eat='no'
commit
--如果是sql 2008的话可以用带OUTPUT的UPDATE语句
update taba set eat='yes' 
output deleted.name,'ok' into taba
where eat='no'
----------结果-----------
/*
id          name eat
----------- ---- ----
1           tom  ok
2           rose yes
3           rose ok
*/