SQL更新top1行查询

Question

以下查询正在运行:

update  top(1) ShipBillInfo 
set     shipfirstname='kkk' 
where   CustomerId='134';

但如果我尝试按某些Id订购,则显示错误:例如:

update  top(1) ShipBillInfo 
set     shipfirstname='kkk' 
where   CustomerId='134' 
order by 
        OredrGUID desc;

Answer 1

With cte as (
select  top(1) shipfirtsname  
From ShipBillInfo 
where   CustomerId='134' 
order by  OredrGUID desc)
Update cte set shipfirstname='abc';

Answer 2

你为什么不这样做:

update ShipBillInfo 
set shipfirstname='kkk' 
where OrderGUID = (select top (1) OrderGUID  
                   from ShipBillInfo 
                   where CustomerId = 134 
                   order by OredrGUID desc )

Answer 3

线程安全

对于线程安全解决方案,所提出的解决方案都不适用于我(某些行在同时执行时不止一次更新).

这有效:

UPDATE Account 
SET    sg_status = 'A'
WHERE  AccountId = 
(
    SELECT TOP 1 AccountId 
    FROM Account WITH (UPDLOCK) --this makes it thread safe
    ORDER  BY CreationDate 
)

如果要返回更新项的某些列,可以将其放在更新语句中:( OUTPUT INSERTED.AccountId在SET和之间WHERE)