SQL QUERY-多個COUNT返回錯誤（相同）結果

如何結合這兩個查詢而不給我相同的輸出？SQL QUERY-多個COUNT返回錯誤（相同）結果

第一查詢是：

select vwemployee.directorateName , count(vwemployeeCourse.employeeId) as t1 

from vwemployee , vwemployeeCourse 

where vwemployee.directorateName = vwemployeeCourse.directorateName 

GROUP BY vwemployee.directorateName

這是第二個查詢：

select vwemployee.directorateName , count(vwemployee.directorateName) as t2 

from vwemployee , employeeCourse 

where vwemployee.Id = employeeCourse.employeeId 

GROUP BY vwemployee.directorateName

我將要使用的組合查詢，以生成報告

的第一列是名的董事會

順便說一句，當我結合他們我自己T1有相同的結果，T2，但是當他們分開它給了我正確的結果

的T1欄應該顯示這個特定首長多少場了，和T2欄應該顯示多少員工的這個董事會下把這個課程

所以組合查詢的表的總列應該是3列

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2016-05-12 ali_saigh

你真的有'VWemployeeCourse'和'employeeCourse'表嗎？還是僅僅是一個錯字？ –

第二個查詢我會使用以下內容。如果一些董事會在一個表/視圖中而不是另一個，我使用完整的外部聯接。如果是拼寫錯誤，並且名稱在兩個查詢中都應該是相同的，則內部（常規）連接將起作用。

With cteQuery1 As 
(
Select vwemployee.directorateName , Count(vwemployeeCourse.employeeId) as t1 
    From vwemployee 
    Join vwemployeeCourse On vwemployee.directorateName = vwemployeeCourse.directorateName 
    Group By vwemployee.directorateName 
) 
Select cteQuery1.directorateName, t1, t2 
    From 
     (
     Select vwemployee.directorateName , Count(vwemployee.directorateName) as t2 
      From vwemployee 
      Join employeeCourse On vwemployee.Id = employeeCourse.employeeId    
      Group By vwemployee.directorateName 
     ) Query2 
    Full Outer Join cteQuery1 On cteQuery1.directorateName = Query2.directorateName

來源

2016-05-12 12:14:33

您可以使用SUM(IF())：

SELECT vwemployee.directorateName, 
    SUM(IF(vwemployee.directorateName = vwemployeeCourse.directorateName),1,0) directorateCount, 
    SUM(IF(vwemployee.Id = employeeCourse.employeeId),1,0) idCount, 
    FROM vwemployee , vwemployeeCourse 
    WHERE vwemployee.directorateName = vwemployeeCourse.directorateName 
     OR vwemployee.Id = employeeCourse.employeeId 
    GROUP BY vwemployee.directorateName

注：我沒有測試出來，所以可能需要一些工作。

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2016-05-12 11:29:42 moscar

錯誤，因爲您引用的表不在'FROM'子句中（'employeeCourse'，而不是'vwemployeeCourse'）。如果這是OP的一個錯字，這應該可以正常工作（儘管可能不是性能）。如果真的有兩張表，這會產生相同的錯誤結果。 –

使用下面的查詢。

Select max(vwemployee.directorateName), sum(t1) as t1, sum(t2) as t2 
(select vwemployee.directorateName , 0 as t1 ,count(vwemployee.directorateName) as t2 
UNION 
select vwemployee.directorateName,count(vwemployeeCourse.employeeId) as t1 , 0 AS t2)

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2016-05-12 11:29:57

試試下面的查詢：

SELECT vwemployee.directorateName AS dN, COUNT(vwemployeeCourse.employeeId) AS t1, t2 
FROM vwemployee 
    JOIN vwemployeeCourse ON vwemployee.directorateName = vwemployeeCourse.directorateName 
    LEFT JOIN (
      SELECT vwemployee.directorateName AS ecdN, COUNT(vwemployee.directorateName) AS t2 
      FROM vwemployee 
       JOIN employeeCourse ON vwemployee.Id = employeeCourse.employeeId 
      GROUP BY vwemployee.directorateName 
      ) AS EmployeeCount 
     ON dN = ecdN 
GROUP BY vwemployee.directorateName

我已經重新格式化您的查詢，以取代舊式聯接語法與如果你是故意使用在employeeCourse代替vwemployeeCourse ANSI-加入

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2016-05-12 11:35:58 Alex

SQL QUERY-多個COUNT返回錯誤（相同）結果

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