使用子查询访问SQL JOIN

debugcn 发表于 Dev

托比

有人可以告诉我如何将该查询转换为可在MS Access中使用吗？

SELECT Shooters.idShooters, Shooters.firstname, Shooters.lastname, JoinedContingent.Count, JoinedShots.Count 
FROM Shooters 
INNER JOIN 
          (SELECT Shooters.idShooters, Count(Contingent.idContingent) AS Count
           FROM Shooters LEFT JOIN Contingent ON Shooters.idShooters = Contingent.fidShooter
           GROUP BY Shooters.idShooters) 
AS JoinedContingent ON JoinedContingent.idShooters = Shooters.idShooters 
INNER JOIN 
          (SELECT Shooters.idShooters, Count(Shots.idShots) AS Count
           FROM Shooters LEFT JOIN Shots ON Shooters.idShooters = Shots.fidShooters
           GROUP BY Shooters.idShooters) 
AS JoinedShots ON JoinedShots.idShooters = Shooters.idShooters;

背景资料：

我想计算Shooter表Contingent和中每个外键的出现次数Shots。结果应如下所示：

  idShooters  |  firstname  |  lastname  |  Count  | Count
____________________________________________________________
      1            John          Doe          0       10
      2            Jane          Doe          1       20
      .
      .
      .

戈登·利诺夫

我认为这是您想要的：

SELECT s.idShooters, s.firstname, s.lastname,
        NZ(c.Count, 0), NZ(sh.Count, 0)
FROM (Shooters as s LEFT JOIN 
      (SELECT c.fidShooter, Count(*) AS Count
       FROM Contingent as c
       GROUP BY c.fidShooter
      ) as c
      ON s.idShooters = c.fidShooter
     ) LEFT JOIN
     (SELECT sh.fidShooters, Count(*) AS Count
      FROM Shots as sh
      GROUP BY sh.fidShooters 
     ) as sh
     ON s.idShooters = sh.fidShooters;

请注意，我将外部联接移到了外部查询。实际上，子查询中不需要连接，因此不必理会。

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