SQL Server 2008 - 如何加入 3 个表
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/5920383/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
SQL Server 2008 - How to Join 3 tables
提问by user450143
SQL Server 2008:
SQL Server 2008：
I have 3 tables
我有3张桌子
Users, Scores, Lessons
Users& Scoresare linked by StudentID
Users&Scores由StudentID
Scores& Lessonsare linked by LessonID
Scores&Lessons由LessonID
I want to display the scores for a StudentID. Here are the columns I want to display
我想显示一个StudentID. 这是我要显示的列
Users.Name, Scores.LessonID, Scores.Result, Lessons.Title
I know how to Join the 2 tables. How do I throw in the 3rd table?
我知道如何加入两张桌子。我怎么扔到第三张桌子？
回答by Alex J
Same way as one table:
与一张桌子相同的方式：
SELECT Users.Name, Scores.LessonID, Scores.Result, Lessons.Title
FROM Users
INNER JOIN Scores ON Users.StudentID = Scores.StudentID
INNER JOIN Lessons On Scores.LessonID = Lessons.LessonID
回答by Lokanathan
SELECT *
FROM T1
INNER JOIN T2
ON T2.C = T1.C
INNER JOIN T3
LEFT JOIN T4
ON T4.C = T3.C
ON T3.C = T2.C
is equivalent to (T1 Inner Join T2) Inner Join (T3 Left Join T4)
