摘要：Left Join Right Join Inner Join的用法与区别 例子Table Aaid adate 1 a1 2 a2 3 a3 TableBbid bdate 1 b1 2 b2 4 b4 两个表a,b相连接,要取出id相同的字段 select * from a inner join b on a.aid = b.bid这是仅取出匹配的数据. 此时的取出的是: 1 a1 b1 2 ... 阅读全文