sql server 2000 表内记录重复有关问题
日期：2014-05-17 浏览次数：20498 次
sql server 2000 表内记录重复问题
在操作数据库时，不小心误操作，导致表中的记录重复录入，如下图所示：
现在想用把重复的记录全部删除掉，只保留一条，其中CSNTusername字段可作为唯一字段，脚本需要如何编写，多谢
------解决方案--------------------
在操作数据库时，不小心误操作，导致表中的记录重复录入，如下图所示：
现在想用把重复的记录全部删除掉，只保留一条，其中CSNTusername字段可作为唯一字段，脚本需要如何编写，多谢
------解决方案--------------------
IF OBJECT_ID(N'Test',N'U') IS NOT NULL
DROP TABLE Test
CREATE TABLE Test
( CSNTusername VARCHAR(50),
CSNTpassword VARCHAR(50),
CSNTresult INT,
CSNTgroup INT,
CSNTacctInfo VARCHAR(50)
)
INSERT INTO Test
SELECT '0000010145','42,42,42,42,',0,0,'' UNION ALL
SELECT '0000010145','42,42,42,42,',0,0,'' UNION ALL
SELECT '0000010145','42,42,42,42,',0,0,'' UNION ALL
SELECT '0000056225','42,56,49,55,53,50,',0,0,'' UNION ALL
SELECT '0000056225','42,56,49,55,53,50,',0,0,'' UNION ALL
SELECT '0000056225','42,56,49,55,53,50,',0,0,'' UNION ALL
SELECT '9100000012','46,46,46,46,46,46,',0,0,'' UNION ALL
SELECT '9100000012','46,46,46,46,46,46,',0,0,'' UNION ALL
SELECT '9100000012','46,46,46,46,46,46,',0,0,'' UNION ALL
SELECT '0000002051','47,42,45,55,56,57,',0,0,'' UNION ALL
SELECT '0000002051','47,42,45,55,56,57,',0,0,'' UNION ALL
SELECT '0000002051','47,42,45,55,56,57,',0,0,'' UNION ALL
SELECT '0000022489','48,48,48,48,',0,0,'' UNION ALL
SELECT '0000022489','48,48,48,48,',0,0,'' UNION ALL
SELECT '0000022489','48,48,48,48,',0,0,''
GO
--删除前
SELECT * FROM Test
--删除后
GO
DELETE FROM dbo.TEST WHERE TEST.%%physloc%% NOT IN (SELECT MIN(b.%%physloc%%)
FROM TEST b GROUP BY CSNTusername)
SELECT * FROM Test
/*
(15 行受影响)
CSNTusername CSNTpassword CSNTresult CSNTgroup CSNTacctInfo
-------------------------------------------------- -------------------------------------------------- ----------- ----------- --------------------------------------------------
0000010145 42,42,42,42, 0 0
0000010145
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