创建报表，报表中重复 output, Ms Access SQL

Question

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;

此查询显示每个技术人员、上次考试、上次 New_Model、上次课程。

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;

此查询显示每个技术人员已完成的工作。

但是，在 Ms Access 中创建报告时，作业会重复。 因此，例如，它显示了 12 个，而不是一个技术人员完成了 3 个工作。 尽管在运行第二个查询本身时，结果不会重复。

有什么帮助吗？

Answer 1

出于显而易见的原因，我通常不阅读其他人的 SQL 查询，但您的示例格式非常好。 这是问题吗？

INNER JOIN (SELECT Technicians.Technician_ID, COUNT(*) AS Final_Exam_Level
    ...
    GROUP BY Technicians.Technician_ID, Technicians.Course_Level 

这两行来自您的第一个查询的第二个子查询。 您有 1 个索引字段（Technician_ID），但有 2 个分组字段（Technician_ID 和 Course_Level）。 这将产生如下结果：

 Technician_ID Final_Exam_Level
 Bob           5
 Bob           4
 Nadine        5

我建议从 Group By 中删除 Course_Level 或将其添加到 Select 行。