学习笔记(14):MySQL数据库从入门到精通实战-表连接（内连接、外连接、自连接）...

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1、表连接

#表连接语法

SELECT table1.column,table2.column

FROM table1,table2

WHERE table1.column1 = table2.column2;

 

表连接包括：

内连接、自连接、外连接

 

实际应用中，掌握内连接和左连接就可。

 

#内连接的语法

select A.stu_no,A.name,B.course,B.score

from student A

join/inner join score B on (A.stu_no = B.stu_no);

 

select A.stu_no,A.name,B.course,B.score

from student A, score B

where A.stu_no = B.stu_no;

 

#左连接语法

select A.stu_no,A.name,B.course,B.score

from student A

left join score B on (A.stu_no = B.stu_no);