[Teach Youself SQL in 十 Minutes] SQL JOIN TABLE

2012-08-24

[Teach Youself SQL in 10 Minutes] SQL JOIN TABLE语法:?SELECT column_name(s)FROM table_name1INNER JO

[Teach Youself SQL in 10 Minutes] SQL JOIN TABLE

语法:

SELECT column_name(s)FROM table_name1INNER JOIN/LEFT JOIN/RIGHT JOIN/FULL JOIN  table_name2 ON table_name1.column_name=table_name2.column_name

?区别:

[Teach Youself SQL in 十 Minutes] SQL JOIN TABLE

1.inner join:不以哪个表为基准，只列出符合条件的记录2.left join:即使右表中没有匹配，也从左表返回所有的行3.right join:即使左表中没有匹配，也从右表返回所有的行4.FULL JOIN: 只要其中一个表中存在匹配，就返回行

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