oracle中各种连接(left join,right join,inner join)用法
2013-03-04 13:27
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left join :左连接,返回左表中所有的记录以及右表中连接字段相等的记录。 right join :右连接,返回右表中所有的记录以及左表中连接字段相等的记录。 inner join :内连接,又叫等值连接,只返回两个表中连接字段相等的行。 full join :外连接,返回两个表中所有的行:left join + right join cross join :结果是笛卡尔积,就是第一个表的行数乘以第二个表的行数。
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