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【MSSQL】消除sql2000里的重复数据

作者:internetafei / 发布于2011/10/9/ 921

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游标版
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 <a href="mailto:id=@id1">id=@id1</a>
end 
set @oldid=@id1
set @Olde_REcordid=@e_REcordid
end 
close price 
DEALLOCATE price

sql语句版
delete from evaeve where id not in( select max(id) from evaeve group by E_RecordID)

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 <a href="mailto:id=@id1">id=@id1</a>
end 
set @oldid=@id1
set @Olde_REcordid=@e_REcordid
end 
close price 
DEALLOCATE price

delete from evaeve where id not in( select max(id) from evaeve group by E_RecordID)

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　重复数据　

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