Question

我希望你能对SQL Server提供相当新的帮助，因此请耐心等待。我正在尝试从CASE语句设置变量，但是遇到了多重标识符错误。代码试图根据两个日期字段的日期范围内的日期变量将值解析为变量。

use KSSDB

declare @DateFrom   as datetime,
    @DateTo     as datetime,
    @ResInt     as int,
    @ProgID     as int,
    @PERSID     as int


set @DateFrom = '2010/11/01'
set @DateTo = '2013/11/01'
set @ProgID = 63
set @PERSID = 4492

--select PT.PROG_ID, 
--      PT.PERS_ID, 
--      P.PROG_NAME,
--      format(PT.PROG_TRAI_SD, 'dd/MM/yyyy') as PROG_TRAI_SD, 
--      format(PT.PROG_TRAI_ED, 'dd/MM/yyyy')as PROG_TRAI_ED,

set @resint =   CASE when (@DateFrom > PT.PROG_TRAI_SD and @dateto < PT.PROG_TRAI_ED) then 1
    when (@datefrom > PT.PROG_TRAI_ED and @DateTo > PT.PROG_TRAI_ED) then 2 
    when (@datefrom < PT.PROG_TRAI_SD and @DateTo > PT.PROG_TRAI_ED) then 3 
    else  0
    end

select @ResInt

from    PROG p
    JOIN PROG_TRAI PT ON P.PROG_ID = PT.PROG_ID

where   PT.PROG_ID = @ProgID and 
    PT.PERS_ID = @PERSID

Answer 1

问题是，您的CASE声明与SELECT ... FROM分开，并且您正尝试使用表格中的数据设置@resint。

尝试使用以下内容：

select @resint 
  = CASE when (@DateFrom > PT.PROG_TRAI_SD and @dateto < PT.PROG_TRAI_ED) then 1
         when (@datefrom > PT.PROG_TRAI_ED and @DateTo > PT.PROG_TRAI_ED) then 2 
         when (@datefrom < PT.PROG_TRAI_SD and @DateTo > PT.PROG_TRAI_ED) then 3 
         else  0
    end
from PROG p
JOIN PROG_TRAI PT 
  ON P.PROG_ID = PT.PROG_ID
where PT.PROG_ID = @ProgID and 
    PT.PERS_ID = @PERSID

无法绑定多部分标识符“”

1 个答案: