一句话明白join、left join、right join、inner join、full join
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一句话明白join、left join、right join、inner join、full join
- JOIN: 如果表中有至少一个匹配，则返回行
- LEFT JOIN: 即使右表中没有匹配，也从左表返回所有的行
- RIGHT JOIN: 即使左表中没有匹配，也从右表返回所有的行
- INNER JOIN:左右表同时匹配，则返回行
- FULL JOIN: 只要其中一个表中存在匹配，就返回行
摘自http://www.w3school.com.cn/sql/sql_join.asp
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