一開始，參考網上的逐條更新辦法：

declare @yuyueskid varchar(40)

declare @shangkesj datetime
declare @yuyuezt int
declare @i int
declare @j int
set @j=(select count(*) from yuyuesk)
set @i=1
while   @i<[email protected]
begin               
    set @yuyueskid=(select yuyueskid from ( select ROW_NUMBER() over (order by yuyueskid asc ) as Row, yuyueskId from yuyuesk ) as sp  where

[email protected])
    set @shangkesj=(select shangkesj from ( select ROW_NUMBER() over (order by yuyueskid asc ) as Row, shangkesj from yuyuesk ) as sp  where [email protected])
    set @yuyuezt=(select yuyuezt from ( select ROW_NUMBER() over (order by yuyueskid asc ) as Row, yuyuezt from yuyuesk ) as sp  where

[email protected])
    update               
        yuyuesk
    set
        yuyuezt=4
    where                
        [email protected] and @yuyuezt=1 and @shangkesj<GETDATE()
        set @[email protected]+1

end

出現的問題是，雖然可以逐條更新，但是需要把表內的資料全部過一次，如果表內資料太多，效率會非常低。

然後改變思路，先把符合更新條件的資料插入臨時表，然後再更新：

declare @yuyueskid varchar(40)
declare @shangkesj datetime
declare @yuyuezt int
declare @i int
declare @j int
select * into #yuyuesk from yuyuesk where yuyuezt=1
set @j=(select count(*) from #yuyuesk)
set @i=1
while   @i<[email protected]
begin               
    set @yuyueskid=(select yuyueskid from ( select ROW_NUMBER() over (order by yuyueskid asc ) as Row, yuyueskId from #yuyuesk ) as sp  where [email protected])
    set @shangkesj=(select shangkesj from ( select ROW_NUMBER() over (order by yuyueskid asc ) as Row, shangkesj from #yuyuesk ) as sp  where [email protected])
    set @yuyuezt=(select yuyuezt from ( select ROW_NUMBER() over (order by yuyueskid asc ) as Row, yuyuezt from #yuyuesk ) as sp  where [email protected])
    update               
        yuyuesk
    set
        yuyuezt=4
    where                
        [email protected] and @yuyuezt=1 and @shangkesj<GETDATE()
        set @[email protected]+1
end

完美解決