1.如果有ID字段，就是具有唯一性的字段 复制代码 代码如下: delect table where id not in ( select max(id) from table group by col1,col2,col3... ) group by 子句后跟的字段就是你用来判断重复的条件，如只有
1.如果有ID字段，就是具有唯一性的字段 复制代码 代码如下: delect table where id not in ( select max(id) from table group by col1,col2,col3... ) group by 子句后跟的字段就是你用来判断重复的条件，如只有col1，那么只要col1字段内容相同即表示记录相同。 2. 如果是判断所有字段也可以这样 复制代码 代码如下: select * into #aa from table group by id1,id2,.... delete table insert into table select * from #aa 3. 没有ID的情况 复制代码 代码如下: select identity(int,1,1) as id,* into #temp from tabel delect # where id not in ( select max(id) from # group by col1,col2,col3...) delect table inset into table(...) select ..... from #temp 4. col1+','+col2+','...col5 联合主键 复制代码 代码如下: select * from table where col1+','+col2+','...col5 in ( select max(col1+','+col2+','...col5) from table where having count(*)>1 group by col1,col2,col3,col4 ) group by 子句后跟的字段就是你用来判断重复的条件，如只有col1，那么只要col1字段内容相同即表示记录相同。 5. 复制代码 代码如下: select identity(int,1,1) as id,* into #temp from tabel select * from #temp where id in ( select max(id) from #emp where having count(*)>1 group by col1,col2,col3...) 6. 复制代码 代码如下: select distinct * into #temp from tablename delete tablename go insert tablename select * from #temp Sqlclub go drop table #temp 以上就是SQL Server删除重复行的方法介绍。
