Question

我有这样的表格。

PollingDivision

       pdID pdName
         1    Homagama
         2    Maharagama
         3    Kesbewa

PollingBooth

       PBID   PBName  pdivID
        1      HP      1
        2      HD      2

PollingBoothElection

       pbID   elecID numofEO
        1         1      3

PollingBoothElectionOfficial

      pbID elecid eOfficialID
        1     1       1

我试图从投票站汇集展位名称，其中分配的选举官方计数（特定elecID的eOfficialID列和PollingBoothElectionOfficial表中的pbID的数量）小于PollingBoothElection中的选举官方数量表格由投票处。

这是我尝试过的。

SELECT 
    PB.PBName, COUNT(PBEO.eOfficialID) AS EOCount
FROM 
    PollingBoothElection PBE
INNER JOIN 
    PollingBooth PB ON PBE.pbID = PB.PBID
INNER JOIN 
    PollingDivision PD ON PB.pdivID = PD.pdID
INNER JOIN 
    PollingBoothElectionOfficial PBEO ON PBE.elecID = PBEO.elecID 
                                      AND PBE.pbID = PBEO.pboothID
WHERE 
    PBE.elecID = 1 
    AND PD.pdName = 'Homagama'
GROUP BY 
    PB.PBName, PBE.numOfEO
HAVING 
    COUNT(PBEO.eOfficialID) < (PBE.numOfEO);

虽然我的表中有数据但它没有给我一个结果。我在这里做错了什么？

预期结果

         pbName Count
          HP      1

因为对于投票站，HP的eo数为3，但在PollingBoothElectionOfficial表中，pbid1 elecid 1只有1条记录，因此计数小于eos的数量（numOfEO）。

Answer 1

我会把它放在这里，因为我会超出评论限制。

您的查询会产生您期望的结果：

示例数据

CREATE TABLE PollingDivision(
    pdID    INT,
    pdName  VARCHAR(20)
)
CREATE TABLE PollingBooth(
    PBID    INT,
    PBName  VARCHAR(20),
    pdivID  INT
)
CREATE TABLE PollingBoothElection(
    pbID    INT,
    elecID  INT,
    numofEO INT
)
CREATE TABLE PollingBoothElectionOfficial(
    pbID        INT,
    electID     INT,
    eOfficialID INT
)
INSERT INTO PollingDivision VALUES (1, 'Homagama'), (2, 'Maharagama'), (3, 'Kesbewa');
INSERT INTO PollingBooth VALUES (1, 'HP', 1), (2, 'HD', 2);
INSERT INTO PollingBoothElection VALUES (1, 1, 3);
INSERT INTO PollingBoothElectionOfficial VALUES (1, 1, 1);

您的（已格式化）查询：

SELECT 
    PB.PBName,
    COUNT(PBEO.eOfficialID) AS EOCount
FROM PollingBoothElection PBE
INNER JOIN PollingBooth PB
    ON PBE.pbID = PB.PBID
INNER JOIN PollingDivision PD
    ON PB.pdivID = PD.pdID
INNER JOIN PollingBoothElectionOfficial PBEO
    ON PBE.elecID = PBEO.electID --replaced PBEO.elecID with PBEO.electID
    AND PBE.pbID = PBEO.pbID -- replaced PBEO.pboothID with PBEO.pbID
WHERE 
    PBE.elecID = 1
    AND PD.pdName = 'Homagama'
GROUP BY PB.PBName, PBE.numOfEO
HAVING COUNT(PBEO.eOfficialID) < (PBE.numOfEO);

<强> RESULT

PBName               EOCount
-------------------- -----------
HP                   1

Answer 2

这应该有助于满足您的需求：

Select PBName, SUM(eOfficialIDCount)[Count]
from (Select pbID, elecID, Count(Distinct eOfficialID)eOfficialIDCount 
        from PollingBoothElectionOfficial Group by pbID, electID)A
Left Join (Select pbID, elecID, numofEO from PollingBoothElection)B On B.pbID+b.elecID = A.pbID+a.elecID
Left Join (Select pbID, PBName from PollingBooth)C On C.pbID = A.pbID
Where eOfficialIDCount < numofEO Group by PBName

带有子句的内连接不提供输出

2 个答案: