如何更新SQL Server中的top 1行

本文关键字：Server 中的 top 1行 SQL 何更新 更新 | 更新日期: 2023-09-27 18:03:33

我想更新表中的最新行。我可以使用

select top 1 ...

，但如何做到这一点与更新?

DECLARE @Result nvarchar(50)
SET @Result = (select top 1 ROUND(SUM(DATEDIFF(SS,CheckIn,CheckOut) / 60.0 / 60.0),2)  from CheckInCheckOut)
update CheckInCheckOut 
set CountHours= @Result 
where UserId_Fk = 3

我想这样做:

update top 1 CheckInCheckOut

请举个例子。

编辑

我得到了正确的查询:

  DECLARE @Result nvarchar(50)
 SET @Result = (select top 1 ROUND(SUM(DATEDIFF(SS,CheckIn,'2014-05-15 03:30:32.507') / 60.0 / 60.0),2)  from CheckInCheckOut where UserId_Fk=3 order by CheckInCheckOutId desc) 
update CheckInCheckOut 
set CheckOut='2014-05-15 03:30:32.507',CountHours=@Result 
where CheckInCheckOutId = (select top (1) CheckInCheckOutId  
               from CheckInCheckOut 
               where UserId_Fk = 3
               order by CheckInCheckOutId desc )

但是我得到的错误是

    'Column "CheckInCheckOut.CheckInCheckOutId" is invalid in the ORDER BY clause because it is not contained in either an aggregate function or the GROUP BY clause.

如何在select语句中使用order by ?

如何更新SQL Server中的top 1行

试试这个:

UPDATE CheckInCheckOut
SET CountHours = @Result
WHERE UserId_Fk = (SELECT TOP 1 UserId_Fk 
                   FROM CheckInCheckOut 
                   ORDER BY [Your_Sort_Column])
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