Question

我正在尝试在SQL Server中创建函数，该函数返回传递给函数的日期范围之间的月份。以下是我目前的脚本 -

CREATE FUNCTION [dbo].[fn_get_date_range]  ( 
@startDate datetime,
@endDate datetime,
@frequency varchar(20)
)
RETURNS  
@dateRanges TABLE 
(
  report_date datetime
)
AS
BEGIN 

    WITH DateRange (report_date) AS
    (   

        SELECT row_number() OVER (ORDER BY object_id) FROM sys.all_objects)
        SELECT DATEADD(s,-1,DATEADD(mm, DATEDIFF(m,0,@StartDate)+report_date,0) 

    ) AS report_date    
    insert into @dateRanges (report_date)
    Select report_date FROM DateRange
    WHERE report_date <= DATEDIFF(month, @StartDate, @EndDate)+1


RETURN 

END

但是当我尝试创建这些函数时，我得到以下错误 -

已定义但未使用的公用表表达式。

我尝试了不同的方法，但它没有用。任何正确方向的指针都将受到赞赏。谢谢。

Answer 1

不允许CTE没有跟SELECT声明，MS引用：

•CTE必须后跟一个SELECT语句。 INSERT，UPDATE，不支持DELETE和MERGE语句。

<强>更新

CREATE FUNCTION [dbo].[fn_get_date_range]  ( 
@startDate datetime,
@endDate datetime,
@frequency varchar(20)
)
RETURNS  
@dateRanges TABLE 
(
  report_date datetime
)
AS
BEGIN 

    WITH DateRange (report_date) AS
    (   

        SELECT row_number() OVER (ORDER BY object_id) FROM sys.all_objects)
        SELECT DATEADD(s,-1,DATEADD(mm, DATEDIFF(m,0,@StartDate)+report_date,0) 

    ) AS report_date    

    Select * FROM DateRange 
    INTO #temp_table
    WHERE report_date <= DATEDIFF(month, @StartDate, @EndDate)+1

    insert into @dateRanges (report_date)
    select * from #temp_table

    drop table #temp_table

    RETURN 

    END

Answer 2

这是我用于动态日期时间范围的TVF。

与您的方法类似，但我确实将DATEPART作为参数和增量。

示例 - 月份增量1：

Select * from [dbo].[tvf-Range-Date]('2016-01-01','2017-01-01','MM',1)

<强>返回

示例 - 分钟增量15：

Select * from [dbo].[tvf-Range-Date]('2017-01-01','2017-01-02','MI',15)

<强>返回

感兴趣的UDF

CREATE FUNCTION [dbo].[tvf-Range-Date] (@R1 datetime,@R2 datetime,@Part varchar(10),@Incr int)
Returns Table
Return (
    with cte0(M)   As (Select 1+Case @Part When 'YY' then DateDiff(YY,@R1,@R2)/@Incr When 'QQ' then DateDiff(QQ,@R1,@R2)/@Incr When 'MM' then DateDiff(MM,@R1,@R2)/@Incr When 'WK' then DateDiff(WK,@R1,@R2)/@Incr When 'DD' then DateDiff(DD,@R1,@R2)/@Incr When 'HH' then DateDiff(HH,@R1,@R2)/@Incr When 'MI' then DateDiff(MI,@R1,@R2)/@Incr When 'SS' then DateDiff(SS,@R1,@R2)/@Incr End),
         cte1(N)   As (Select 1 From (Values(1),(1),(1),(1),(1),(1),(1),(1),(1),(1)) N(N)),
         cte2(N)   As (Select Top (Select M from cte0) Row_Number() over (Order By (Select NULL)) From cte1 a, cte1 b, cte1 c, cte1 d, cte1 e, cte1 f, cte1 g, cte1 h ),
         cte3(N,D) As (Select 0,@R1 Union All Select N,Case @Part When 'YY' then DateAdd(YY, N*@Incr, @R1) When 'QQ' then DateAdd(QQ, N*@Incr, @R1) When 'MM' then DateAdd(MM, N*@Incr, @R1) When 'WK' then DateAdd(WK, N*@Incr, @R1) When 'DD' then DateAdd(DD, N*@Incr, @R1) When 'HH' then DateAdd(HH, N*@Incr, @R1) When 'MI' then DateAdd(MI, N*@Incr, @R1) When 'SS' then DateAdd(SS, N*@Incr, @R1) End From cte2 )

    Select RetSeq = N+1
          ,RetVal = D 
     From  cte3,cte0 
     Where D<=@R2
)
/*
Max 100 million observations -- Date Parts YY QQ MM WK DD HH MI SS
Syntax:
Select * from [dbo].[tvf-Range-Date]('2016-10-01','2020-10-01','YY',1) 
Select * from [dbo].[tvf-Range-Date]('2016-01-01','2017-01-01','MM',1) 
*/

编辑 - 按要求

CREATE FUNCTION [dbo].[tvf-Range-Date-Span] (@R1 datetime,@R2 datetime,@Part varchar(10),@Incr int)
Returns Table
Return (
    with cte0(M)   As (Select 1+Case @Part When 'YY' then DateDiff(YY,@R1,@R2)/@Incr When 'QQ' then DateDiff(QQ,@R1,@R2)/@Incr When 'MM' then DateDiff(MM,@R1,@R2)/@Incr When 'WK' then DateDiff(WK,@R1,@R2)/@Incr When 'DD' then DateDiff(DD,@R1,@R2)/@Incr When 'HH' then DateDiff(HH,@R1,@R2)/@Incr When 'MI' then DateDiff(MI,@R1,@R2)/@Incr When 'SS' then DateDiff(SS,@R1,@R2)/@Incr End),
         cte1(N)   As (Select 1 From (Values(1),(1),(1),(1),(1),(1),(1),(1),(1),(1)) N(N)),
         cte2(N)   As (Select Top (Select M from cte0) Row_Number() over (Order By (Select NULL)) From cte1 a,cte1 b,cte1 c,cte1 d,cte1 e,cte1 f,cte1 g,cte1 h ),
         cte3(N,D) As (Select 0,@R1 Union All Select N,Case @Part When 'YY' then DateAdd(YY,N*@Incr,@R1) When 'QQ' then DateAdd(QQ,N*@Incr,@R1) When 'MM' then DateAdd(MM,N*@Incr,@R1) When 'WK' then DateAdd(WK,N*@Incr,@R1) When 'DD' then DateAdd(DD,N*@Incr,@R1) When 'HH' then DateAdd(HH,N*@Incr,@R1) When 'MI' then DateAdd(MI,N*@Incr,@R1) When 'SS' then DateAdd(SS,N*@Incr,@R1) End From cte2 )

    Select RetSeq  = N+1
          ,RetVal1 = D
          ,RetVal2 = LEAD(D,1,@R2) over (Order By D)
    From   cte3,cte0 
    Where  N<cte0.M-1
)
--Max 100 million observations -- Date Parts YY QQ MM WK DD HH MI SS
--Select * from [dbo].[tvf-Range-Date-Span]('2016-10-01','2020-10-01','YY',1)

返回类似

的内容

编辑2 - 2008年

;with cte as (
    Select * from [dbo].[tvf-Range-Date]('2016-01-01','2017-01-01','MM',1) 
)
Select DateR1 = A.RetVal
      ,DateR2 = B.NxtDate
 From cte A
 Cross Apply (Select NxtDate=min(RetVal) from cte where RetVal > A.RetVal ) B
 Where B.NxtDate is not null

<强>返回

Answer 3

这是与John的功能类似的变体......

CREATE FUNCTION dbo.tfn_BuildDateRanges
(
    @startDate DATETIME,
    @endDate DATETIME,
    @dateInterval VARCHAR(20),
    @interval INT
)
RETURNS TABLE WITH SCHEMABINDING AS
RETURN
    WITH 
        cte_n1 (n) AS (SELECT 1 FROM (VALUES (1),(1),(1),(1),(1),(1),(1),(1),(1),(1)) n (n)), 
        cte_n2 (n) AS (SELECT 1 FROM cte_n1 a CROSS JOIN cte_n1 b),
        cte_n3 (n) AS (SELECT 1 FROM cte_n2 a CROSS JOIN cte_n2 b),
        cte_Calendar AS (
            SELECT TOP ((CASE
                            WHEN @dateInterval IN ('year', 'yy', 'yyyy')    THEN DATEDIFF(year,         @startDate, @endDate)
                            WHEN @dateInterval IN ('quarter', 'qq', 'q')    THEN DATEDIFF(quarter,      @startDate, @endDate)
                            WHEN @dateInterval IN ('month', 'mm', 'm')      THEN DATEDIFF(month,        @startDate, @endDate)
                            WHEN @dateInterval IN ('week    wk, ww')        THEN DATEDIFF(week,         @startDate, @endDate)
                            WHEN @dateInterval IN ('day', 'dd', 'd')        THEN DATEDIFF(day,          @startDate, @endDate)
                            WHEN @dateInterval IN ('hour', 'hh')            THEN DATEDIFF(hour,         @startDate, @endDate)
                            WHEN @dateInterval IN ('minute', 'mi', 'n')     THEN DATEDIFF(minute,       @startDate, @endDate)
                            WHEN @dateInterval IN ('second', 'ss', 's')     THEN DATEDIFF(second,       @startDate, @endDate)
                        END / @interval + 1))
                BegOfRange = CASE
                        WHEN @dateInterval IN ('year', 'yy', 'yyyy')    THEN DATEADD(year,          (ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) -1) * @interval, @startDate)
                        WHEN @dateInterval IN ('quarter', 'qq', 'q')    THEN DATEADD(quarter,       (ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) -1) * @interval, @startDate)
                        WHEN @dateInterval IN ('month', 'mm', 'm')      THEN DATEADD(month,         (ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) -1) * @interval, @startDate)
                        WHEN @dateInterval IN ('week    wk, ww')        THEN DATEADD(week,          (ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) -1) * @interval, @startDate)
                        WHEN @dateInterval IN ('day', 'dd', 'd')        THEN DATEADD(day,           (ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) -1) * @interval, @startDate)
                        WHEN @dateInterval IN ('hour', 'hh')            THEN DATEADD(hour,          (ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) -1) * @interval, @startDate)
                        WHEN @dateInterval IN ('minute', 'mi', 'n')     THEN DATEADD(minute,        (ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) -1) * @interval, @startDate)
                        WHEN @dateInterval IN ('second', 'ss', 's')     THEN DATEADD(second,        (ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) -1) * @interval, @startDate)
                    END,
            EndOfRange = CASE
                        WHEN @dateInterval IN ('year', 'yy', 'yyyy')    THEN DATEADD(year,          (ROW_NUMBER() OVER (ORDER BY (SELECT NULL))     ) * @interval, @startDate)
                        WHEN @dateInterval IN ('quarter', 'qq', 'q')    THEN DATEADD(quarter,       (ROW_NUMBER() OVER (ORDER BY (SELECT NULL))     ) * @interval, @startDate)
                        WHEN @dateInterval IN ('month', 'mm', 'm')      THEN DATEADD(month,         (ROW_NUMBER() OVER (ORDER BY (SELECT NULL))     ) * @interval, @startDate)
                        WHEN @dateInterval IN ('week    wk, ww')        THEN DATEADD(week,          (ROW_NUMBER() OVER (ORDER BY (SELECT NULL))     ) * @interval, @startDate)
                        WHEN @dateInterval IN ('day', 'dd', 'd')        THEN DATEADD(day,           (ROW_NUMBER() OVER (ORDER BY (SELECT NULL))     ) * @interval, @startDate)
                        WHEN @dateInterval IN ('hour', 'hh')            THEN DATEADD(hour,          (ROW_NUMBER() OVER (ORDER BY (SELECT NULL))     ) * @interval, @startDate)
                        WHEN @dateInterval IN ('minute', 'mi', 'n')     THEN DATEADD(minute,        (ROW_NUMBER() OVER (ORDER BY (SELECT NULL))     ) * @interval, @startDate)
                        WHEN @dateInterval IN ('second', 'ss', 's')     THEN DATEADD(second,        (ROW_NUMBER() OVER (ORDER BY (SELECT NULL))     ) * @interval, @startDate)
                    END
        FROM 
            cte_n3 a CROSS JOIN cte_n3 b
        )
SELECT 
    c.BegOfRange, 
    c.EndOfRange
FROM
    cte_Calendar c;
GO

SQL Server函数 - 已定义CTE但未使用

3 个答案: