摘要: 0.表数据 1.innerJoin(取交集) 图: sql: select * from A inner join B on A.name=b.name; 结果: 2.leftJoin 图: sql: select * from A left join B on a.name=b.name; 结果: 阅读全文
posted @ 2021-01-11 21:39 BigWrite 阅读(68) 评论(0) 推荐(0) 编辑