部分关键字段重复的记录(保留最后记录)

表名：tableName   字段 ID，CODE，LogTime

数据如：

ID，CODE，LogTime

1，A1234，2011-09-02 13:12:10

2，A1234，2011-09-03 13:12:10

3，A1237，2011-09-04 13:12:10

4，A1237，2011-09-04 13:12:10

5，A1237，2011-09-05 13:12:10

 

想要删除的数据

ID，CODE，LogTime

2，A1234，2011-09-03 13:12:10

5，A1237，2011-09-05 13:12:10

 

SQL:

先找到想要的数据

select Code,max(logtime) from tableName  group by Code

哈哈。。。删除不了。

从网上搜了一个如下：

SQL Server

select identity(int,1,1) as autoID, * into #Tmp from tableName;

select min(autoID) as autoID into #Tmp2 from #Tmp group by Name,Address;

drop table tableName;

select * into tableName from #Tmp where autoID in(select autoID from #Tmp2);

drop table #Tmp;

drop table #Tmp2;

改成自己的如下：

select identity(int,1,1) as autoID, * into #Tmp from #table1 Order by logtime;   //按时间大排序

select maX(autoID) as autoID into #Tmp2 from #Tmp group by Code  //同一CODE的取最大的AUTOID

drop table tableName;

select * into tableName from #Tmp where autoID in(select autoID from #Tmp2);

drop table #Tmp;

drop table #Tmp2;

 

OVER!

转载于:https://www.cnblogs.com/dkongyying/archive/2011/11/04/2236451.html