[英]Creating Report, repetition in report output, Ms Access SQL
SELECT NMC.*, Exam.Final_Exam_Level
FROM
(SELECT Technicians.Technician_ID AS Technician_ID,
Technicians.First_Name AS First_Name,
Technicians.Surname AS Surname,
MAX(New_Models.Date_Issued) AS Last_Course_Date,
MAX(New_Models.Issue) AS Last_Issue,
MAX(New_Models.Model_ID) AS Last_Model_ID,
Technicians.Course_Level AS No_Training_Courses
FROM New_Models, New_Models_Allocation, Technicians
WHERE New_Models.Model_ID=New_models_Allocation.Model_ID
And Technicians.Technician_ID=New_Models_Allocation.Technician_ID
GROUP BY Technicians.Technician_ID, Technicians.Course_Level, First_Name, Surname
ORDER BY MAX(New_Models.Model_ID) DESC)
AS NMC
INNER JOIN (SELECT Technicians.Technician_ID, COUNT(*) AS Final_Exam_Level
FROM Technicians, Exams, Exam_Allocation
WHERE (Technicians.Technician_ID)=Exam_Allocation.Technician_ID
And ((Exams.Exam_ID)=Exam_Allocation.Exam_ID)
And (Exams.Date_Taken)<=#12/31/2010#
GROUP BY Technicians.Technician_ID, Technicians.Course_Level
ORDER BY Technicians.Technician_ID)
AS Exam ON Exam.Technician_ID=NMC.Technician_ID;
此查詢顯示每個技術人員、上次考試、上次 New_Model、上次課程。
SELECT Technicians.Technician_ID, Jobs.Job_ID, Jobs.Date_Occured, Fix
FROM Technicians, Jobs, Tech_Allocation, Recovery
WHERE Technicians.Technician_ID=Tech_Allocation.Technician_ID
And Jobs.Job_ID=Tech_Allocation.Job_ID
And Jobs.Job_ID=Recovery.Job_ID
And Jobs.Date_Occured>=#1/1/2010#
And Jobs.Date_Occured<=#12/31/2010#
ORDER BY Fix;
此查詢顯示每個技術人員已完成的工作。
但是,在 Ms Access 中創建報告時,作業會重復。 因此,例如,它顯示了 12 個,而不是一個技術人員完成了 3 個工作。 盡管在運行第二個查詢本身時,結果不會重復。
有什么幫助嗎?
出於顯而易見的原因,我通常不閱讀其他人的 SQL 查詢,但您的示例格式非常好。 這是問題嗎?
INNER JOIN (SELECT Technicians.Technician_ID, COUNT(*) AS Final_Exam_Level
...
GROUP BY Technicians.Technician_ID, Technicians.Course_Level
這兩行來自您的第一個查詢的第二個子查詢。 您有 1 個索引字段(Technician_ID),但有 2 個分組字段(Technician_ID 和 Course_Level)。 這將產生如下結果:
Technician_ID Final_Exam_Level
Bob 5
Bob 4
Nadine 5
我建議從 Group By 中刪除 Course_Level 或將其添加到 Select 行。
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