Question

我想更新表格中的最新一行。为此，我可以使用

select top 1 ...

但如何通过更新来完成此操作？

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

我想做的有点像这样：

update top 1 CheckInCheckOut

示例将不胜感激。

修改

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 )

但是我得到了这个错误

    '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.

＆＃39;

如何在我的select语句中使用order by？

Answer 1

试试这个：

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

如何更新SQL Server中的前1行

1 个答案: