在滿足ALL條件的一個字段上使用多個條件進行查詢

Question

我有一個查詢，可以找回任何具有任何課程的任何人的列表。我需要列出誰擁有所有課程並且沒有過期。我不想看到課程列表只是列出了所有5門課程的人員名單。我正在使用MS Access 2010 SQL。

SELECT tblEmployees.LName, tblEmployees.FName, tblEmployees.Trade, 
     tblEmployees.Title, tblTrainingHistory.Date, tblCourses.CourseName, 
     IIf(IsNull(CourseLength),"",DateAdd("m",[CourseLength],[Date])) AS ExpiryDate 
FROM tblEmployees LEFT JOIN (tblCourses RIGHT JOIN tblTrainingHistory ON 
     tblCourses.CourseID = tblTrainingHistory.CourseID) 
     ON tblEmployees.EmpID = tblTrainingHistory.EmpID 
WHERE 
    (((tblCourses.CourseName) 
     In ("Confined Space","Manwatch","Ventis MX4","First Aid","CPR")) 
    AND ((IIf(IsNull([CourseLength]),Now(),DateAdd("m",[CourseLength],[Date])))>Now()) 
    AND ((tblEmployees.Active)=True)) 
GROUP BY tblEmployees.LName, tblEmployees.FName, tblEmployees.Trade, 
     tblEmployees.Title, tblTrainingHistory.Date, tblCourses.CourseName, 
     tblEmployees.EmpID, tblCourses.CourseLength ; 

Answer 1

使用你的結果表，由集團全體員工的特點和只選擇那些誰擁有COUNT（*）等於5（因爲你有5門課程）。

SELECT LName, FName, Trade, Title, count(*) as courses 
FROM(
SELECT tblEmployees.LName, tblEmployees.FName, tblEmployees.Trade, 
     tblEmployees.Title, tblTrainingHistory.Date, tblCourses.CourseName, 
     IIf(IsNull(CourseLength),"",DateAdd("m",[CourseLength],[Date])) AS ExpiryDate 
FROM tblEmployees LEFT JOIN (tblCourses RIGHT JOIN tblTrainingHistory ON 
     tblCourses.CourseID = tblTrainingHistory.CourseID) 
     ON tblEmployees.EmpID = tblTrainingHistory.EmpID 
WHERE 
    (((tblCourses.CourseName) 
     In ("Confined Space","Manwatch","Ventis MX4","First Aid","CPR")) 
    AND ((IIf(IsNull([CourseLength]),Now(),DateAdd("m",[CourseLength],[Date])))>Now()) 
    AND ((tblEmployees.Active)=True)) 
GROUP BY tblEmployees.LName, tblEmployees.FName, tblEmployees.Trade, 
     tblEmployees.Title, tblTrainingHistory.Date, tblCourses.CourseName, 
     tblEmployees.EmpID, tblCourses.CourseLength) results 
GROUP BY LName, FName, Trade, Title 
HAVING count(*) = 5 ; 

子查詢可能不是必需的，但由於您的查詢相當複雜，我不想惹它。你可以嘗試在一個查詢中這樣做只是

見related question with simpler tables