Select 从子查询到主查询的最小日期值

Question

我正在尝试获取最小日期值作为主查询中的一列，其中主查询和子查询具有内部联接并且最小日期值取决于主查询联接中的 3 列的分组

我在主查询 Select 语句中尝试了子查询，但正如我的研究所示，它们只执行一次。我尝试了各种连接方式，但无法使逻辑或语法起作用。我认为 cte 的组合可能会起作用，但一直无法理解（对于学习新技巧的老狗来说，这些高级查询仍然有点太新了）

DECLARE

@StartBallDate date = '09-05-2009',
@StartLatDate date = '09-05-2009',
@Male int = 1,
@Female int = 4

SELECT T.*, E.StylID, C.PtsFirstRec

FROM dbo.tblPtsPerCompHistory AS T 
        INNER JOIN 
        (
        SELECT Min(Comp_Date) PtsFirstRec, Competition_Idx
        FROM tblCompetitions 
        GROUP BY Comp_Date, Competition_Idx
        ) C ON C.Competition_Idx = T.PtsCompID

        INNER JOIN tblEvtStructure AS E ON E.EvtStruct_Idx = T.PtsStructID

        WHERE E.SectnID Not Between 9 And 10 And (T.PtsMale = @Male Or T.PtsFemale = @Female And E.StylID = 1 And PtsFirstRec >= @StartBallDate) Or (T.PtsMale = @Male Or T.PtsFemale = @Female And E.StylID = 2 And PtsFirstRec >= @StartLatDate)

到目前为止，我得到的是每一行的 Comp_Date。我需要实现的目标是

T.PtsMale      T.PtsFemale      C.Comp_Date      E.StylID      PtsFirstRec
1               4                2009-05-05       1            2009-05-05
1               4                2009-05-05       2            2009-05-05
1               4                2010-03-16       1            2009-05-05
1               202              2015-03-25       1            2015-03-25
1               4                2015-03-25       2            2009-05-05
1               202              2016-07-17       1            2015-03-25

所以我有 Ptsmale 或 PtsFemale 的所有行，但最小日期值 PtsFirstRec 是配对的最早日期，也按 E.StylID

Answer 1

这是另一个window函数一：

DECLARE

@StartBallDate date = '09-05-2009',
@StartLatDate date = '09-05-2009',
@Male int = 1,
@Female int = 4

SELECT T.*, E.StylID, MIN(C.PtsFirstRec) OVER (PARTITION BY T.PtsMale      T.PtsFemale, E.StylID ORDER BY C.Comp_Date ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) [NewValue]

FROM dbo.tblPtsPerCompHistory AS T 
        INNER JOIN 
        (
        SELECT Min(Comp_Date) PtsFirstRec, Competition_Idx
        FROM tblCompetitions 
        GROUP BY Comp_Date, Competition_Idx
        ) C ON C.Competition_Idx = T.PtsCompID

        INNER JOIN tblEvtStructure AS E ON E.EvtStruct_Idx = T.PtsStructID

        WHERE E.SectnID Not Between 9 And 10 And (T.PtsMale = @Male Or T.PtsFemale = @Female And E.StylID = 1 And PtsFirstRec >= @StartBallDate) Or (T.PtsMale = @Male Or T.PtsFemale = @Female And E.StylID = 2 And PtsFirstRec >= @StartLatDate)

如果您包含测试数据，我们将能够确保代码确实有效。但它应该是这样的。

Select 从子查询到主查询的最小日期值

Select Min Date value from subquery to main query

sql

subquery

min