随笔59 SQL Left Join, Right Join, Inner Join, and Natural Join 

1 A LEFT JOIN B      =       A LEFT OUTER JOIN B
2 A RIGHT JOIN B     =       A RIGHT OUTER JOIN B
3 A FULL JOIN B      =       A FULL OUTER JOIN B
4 A INNER JOIN B     =       A JOIN B

 

posted @ 2017-11-23 19:24  叶枫啦啦  阅读(139)  评论(0)    收藏  举报