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;

此查询显示每位技师，上次考试，上次New_Model，上一课程。

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;

此查询显示每位技术人员已完成的工作。

但是，在Ms Access中创建报表时，会重复这些作业。因此，代替技术人员完成3个工作，例如显示12个。虽然在运行第二个查询本身时，结果不会重复。

任何帮助？

Answer 1

由于显而易见的原因，我通常不会阅读其他人的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。

创建报告，在报告输出中重复，Ms Ms SQL

1 个答案: