当前位置 : 主页 > 数据库 > mssql >

sql2000数据库清除重复数据的二种方法

来源:互联网 收集:自由互联 发布时间:2021-04-05
使用游标实现 复制代码 代码如下: declare @id1 int,@oldid int,@e_REcordid int ,@Olde_REcordid int DECLARE price CURSOR FOR SELECT id ,E_recordId FROM evaeve order by E_recordId desc OPEN price FETCH NEXT FROM price into @oldid,@

使用游标实现
复制代码 代码如下:
declare @id1 int,@oldid int,@e_REcordid int ,@Olde_REcordid int
DECLARE price CURSOR
FOR SELECT id ,E_recordId FROM evaeve order by  E_recordId desc
OPEN price
FETCH NEXT FROM price  into @oldid,@Olde_REcordid
while @@fetch_status  = 0
begin
FETCH NEXT FROM price  
into @id1,@e_REcordid

if @Olde_REcordid=@e_REcordid
BEGIN
  delete from evaeve where id=@id1
end
set @oldid=@id1
set @Olde_REcordid=@e_REcordid
end 
close price
DEALLOCATE price

使用sql语句实现
复制代码 代码如下:
delete   from evaeve where id not in(  select max(id)  from evaeve group by   E_RecordID)

网友评论