Question

可能重复：
  Remove duplicates in large MySql table
  Can I extract the extract records that are duplicated in sql?
  How can I delete duplicate rows in a table

我需要删除数据库中重复的行。

我发现使用此查询在表中重复了多少行：

SELECT GoodCode FROM Good_

这里是不同的查询SELECT Distinct GoodCode FROM Good_

第二个记录较低。请指导我如何从第一行中删除重复的行。

Answer 1

简单方法：

SELECT DISTINCT *
INTO   #TempGood
FROM   Good_

TRUNCATE TABLE Good_

INSERT Good_
SELECT *
FROM   #TempGood

DROP TABLE #TempGood

Answer 2

create table temptable as select distinct * from Good_;
drop table Good_;
rename temptable to Good_;

如何从数据库中删除重复的行？

2 个答案: