SQL从多个表中选择

Question

我有四个表Student，Enrolment，Building，Campus，其字段为：

学生：

• StudentID
• 名称
• 等级

报名：

• 参考
• StudentID
• 场
• EnrolDate
• Building_ID

建筑：

• BuildingID
• BuildingName
• CampusID

校园：

• CampusID
• CampusName

我需要Name在CampusName =＆＃39; City Centre＆＃39;注册并就读的学生。{{1}}。我尝试过很多东西，但因为它需要多个连接到不同的表格，所以我真的很困惑。

谢谢

Answer 1

按顺序进行连接 - 从左到右：

SELECT *
FROM Student S
JOIN Enrolment E ON E.StudentID = S.StudentID
JOIN Building B ON B.BuildingID = E.Building_ID
JOIN Campus C ON C.CampusID = B.CampusID
WHERE C.CampusName = 'City Centre'

Answer 2

这样的事情：

SELECT S.Name
FROM Student S
INNER JOIN Enrolment E ON S.StudentID = E.StudentID
INNER JOIN Building B ON E.Building_ID = B.BuildingID
INNER JOIN Campus C ON C.CampusID = B.CampusID
WHERE C.CampusName = 'City Centre'

Answer 3

试试这个：

SELECT S.* 
FROM Students S INNER JOIN
Enrolment E ON E.StudentID=S.StudentID INNER JOIN
Building B ON B.BuildingID= E.Building_ID INNER JOIN
Campus C ON C.CampusID=E.CampusID
WHERE CampusName = 'City Centre'