Sql 子查询中的变量未接收变量值

我以前从未尝试过将变量值传递给子查询，而且我似乎做得不对。我没有收到任何错误，但也没有得到任何结果，而如果我将startdate、enddate和role的值硬编码到子查询中，它就会正确运行

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糟糕的是，我发布了我正在玩的早期测试脚本，它确实充满了错误，对此表示抱歉。以下是我正在使用的实际代码的全部内容：

DECLARE @Role varchar,
    @StartDate datetime,
    @Enddate datetime;

SET     @Role = 'Volunteer';
SET     @StartDate = DATEADD(d, -100, getdate());
SET     @Enddate = getdate();

SELECT rolename, Category, [1] as [1 Day],[2] as [2 Days],[3] as [3 Days],[4] as [4 Days],[5] as [5 Days],[6] as [6 Days],[7] as [7 Days]  FROM
(SELECT    CriminalHistoryID, vps.RoleName, 'Rec2PreClr' as Category,
        DATEDIFF(d, chc.ReceiveDate, chc.PreClrDate) as DaysDif
  FROM  dbo.v_PersonStatus vps
              INNER JOIN dbo.CriminalHistoryCheck chc
                    ON vps.PersonID = chc.PersonID
  WHERE chc.ReceiveDate BETWEEN @StartDate AND @Enddate AND vps.rolename = @Role and DATEDIFF(d, chc.ReceiveDate, chc.PreClrDate) BETWEEN 0 and 7
  UNION
  SELECT      CriminalHistoryID, vps.RoleName, 'PreClr2Clr' as Category,
              DATEDIFF(d, chc.PreClrDate, chc.FinalDate) as DaysDif
  FROM  dbo.v_PersonStatus vps
              INNER JOIN dbo.CriminalHistoryCheck chc
                    ON vps.PersonID = chc.PersonID
  WHERE chc.ReceiveDate BETWEEN @StartDate AND @Enddate AND vps.rolename = @Role AND DATEDIFF(d, chc.PreClrDate, chc.FinalDate) BETWEEN 0 and 7
  UNION
  SELECT      CriminalHistoryID, vps.RoleName, 'Rec2Clr' as Category,
              DATEDIFF(d, chc.ReceiveDate, FinalDate) as DaysDif
  FROM  dbo.v_PersonStatus vps
              INNER JOIN dbo.CriminalHistoryCheck chc
                    ON vps.PersonID = chc.PersonID
  WHERE chc.ReceiveDate BETWEEN @StartDate AND @Enddate AND vps.rolename = @Role AND DATEDIFF(d, chc.ReceiveDate, FinalDate) BETWEEN 0 and 7
  ) UNIONqry
PIVOT
(count(CriminalHistoryID) for DaysDif in ([1],[2],[3],[4],[5],[6],[7])) pvt
Order by RoleName, Category

@Startdate、@Enddate和@Role的值似乎没有进入子查询。我是否需要做些什么来告诉潜艇从盒子外面看？

两个问题：

您没有为volStatus赋值

它应该是

@volstatus

，而不是

@volstatus

-没有空格

因此，改变：

WHERE chc.ReceiveDate BETWEEN @StartDate AND @Enddate AND vps.rolename = @ VolStatus and DATEDIFF(d, chc.ReceiveDate, chc.PreClrDate) BETWEEN 0 and 7

致：

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你犯了什么错误？您确定要同时运行所有代码吗？您不能先运行

declare

，然后再运行子查询——对于正在运行的语句，定义只能持续一段时间。看起来这不是全部代码，而是一个联合。如果您按照这里所写的方式运行所有这些，它将失败并出现语法错误。如果您不设置@VolStatus，它将为NULL。根据您的ANSI_NULL设置，您可以获取数据，也可以不获取数据。。。我猜这可能是您的问题。请注意，您确实不应该在日期/时间/时间戳类型中使用

BETWEEN

。真的，这是一种错误的思考时间的方式，不管。。。RDBMS可能有不规则之处。@Clockwork Muse-我应该怎么做？

WHERE chc.ReceiveDate BETWEEN @StartDate AND @Enddate AND vps.rolename = @VolStatus and DATEDIFF(d, chc.ReceiveDate, chc.PreClrDate) BETWEEN 0 and 7