Question

我想使用内部联接来列出学生每周的学生ID，姓名和时间表总时数，当时学生每周工作时间超过4小时。

我这里需要三张桌子，student，studentReg和roomBooking如下

 student

 id | fname | surname | courseCode

studentReg

sID | modCode

roomBooking

bookingID | roomCode | moduleCode | dayReq | timeReq | semester | classSize

到目前为止我的SQL查询是

 SELECT COUNT(moduleCode) AS [Lecture Hours],
 id, fname, surname
 FROM (student INNER JOIN studentReg ON student.id = studentReg.sID
        INNER JOIN roomBooking ON studentReg.modCode = roomBooking.moduleCode)
 HAVING COUNT (moduleCode) > 4;

当我尝试运行它时，我在表达式＆＃34;

中得到了＃34;语法错误

任何人都可以帮我解决问题所在吗？

Answer 1

永远不确定ms访问中的嵌套连接，但我会尝试类似的东西

SELECT COUNT(moduleCode) AS [Lecture Hours],
 id, fname, surname
 FROM student 
 INNER JOIN (studentReg 
        INNER JOIN roomBooking ON studentReg.modCode = roomBooking.moduleCode)
        ON student.id = studentReg.sID
 GROUP BY id, fname, surname
 HAVING COUNT (moduleCode) > 4

或者

SELECT COUNT(moduleCode) AS [Lecture Hours],
 id, fname, surname
 FROM (student INNER JOIN studentReg ON student.id = studentReg.sID)
        INNER JOIN roomBooking ON studentReg.modCode = roomBooking.moduleCode
 GROUP BY id, fname, surname
 HAVING COUNT (moduleCode) > 4;

SQL查询 - Count（）和内部联接

1 个答案: