函数中包含的 Select 语句无法将数据返回到 client_New

Question

我一直在阅读问题标题上的错误信息，但我无法弄清楚下面代码中的错误是什么：

CREATE function [RPT].[MonthlyRollupDates_Delimited]()
RETURNS @table TABLE (Value varchar(max))
AS
BEGIN

Declare @Count int , @Date date = getdate(),@Month int
SET @Month = MONTH(@Date)
SET  @Count = @Month +12


Select 
top (@Count) 
CalendarDate,   BusinessDay, Label
from  MonthlyRollupDates
order by Calendardate desc

return
end
GO

我得到的错误是

函数中包含的 Select 语句不能将数据返回到 客户

Answer 1

您需要将SELECT的结果放入您的返回表中，然后返回该表。

CREATE function [RPT].[MonthlyRollupDates_Delimited]()
--notice i modified the table to match the select statement, but assumed datatypes
RETURNS @table TABLE (CalendarDate datetime, BusinessDay int, Label char(10))
AS
BEGIN

declare @Count int
SET @Count = month(getdate()) + 12

--place your select into the table variable
insert into @table
Select top (@Count) 
    CalendarDate
    ,BusinessDay
    ,Label
from  
    MonthlyRollupDates
order by 
    Calendardate desc

return
end
GO