Question

我正在使用SQL Server 2012并且我有以下T-SQL查询。但是，它在执行时给出了一条错误消息。

错误消息是：

Msg 1014, Level 15, State 1, Line 2
A TOP or FETCH clause contains an invalid value.

我的T-SQL查询如下：

;WITH N(N)AS 
(SELECT 1 FROM(VALUES(1),(1),(1),(1),(1),(1),(1),(1),(1),(1))M(N)),
tally(N)AS(SELECT 1 FROM N,N a,N b,N c,N d)

INSERT INTO Allot4

SELECT
       b.Date as [TDate],
       Season,
       RN,
       TAProfileID,
       TOName,
       Market,
       RoomType,
       Property,     
       TOType

    FROM Allot3 a
    CROSS APPLY
    ( 
      SELECT top(datediff(d,Datefrom,case when DateTo >= DateFrom
                 then dateadd(d, 1, DateTo) else DateFrom end))
        DATEADD(d,row_number()over(order by 1/0)-1, DateFrom) Date
      FROM tally
    ) b

这里有什么问题，如何解决？

Answer 1

当我们在TOP子句中指定表达式时，我们必须确保在计算时表达式不应返回NULL。我在你的陈述中添加了ISNULL -

;WITH N(N)AS 
(SELECT 1 FROM(VALUES(1),(1),(1),(1),(1),(1),(1),(1),(1),(1))M(N)),
tally(N)AS(SELECT 1 FROM N,N a,N b,N c,N d)

INSERT INTO Allot4

SELECT
       b.Date as [TDate],
       Season,
       RN,
       TAProfileID,
       TOName,
       Market,
       RoomType,
       Property,     
       TOType

    FROM Allot3 a
    CROSS APPLY
    ( 
      SELECT top(isnull(datediff(d,Datefrom,case when DateTo >= DateFrom
                 then dateadd(d, 1, DateTo) else DateFrom end)),0)
        DATEADD(d,row_number()over(order by 1/0)-1, DateFrom) Date
      FROM tally
    ) b

我们可以阅读更多关于TOP条款的内容 - https://docs.microsoft.com/en-us/sql/t-sql/queries/top-transact-sql

为什么我收到错误消息“TOP或FETCH子句包含无效值”？

1 个答案: