2021年8月4日
left join和left outer join的区别
摘要： select a.*,b.* from a left join b on a.k = b.k select a.*,b.* from a left outer join b on a.k =b.k 上面两种一样left join是left outer join的简写 也很及时说： left join 阅读全文
posted @ 2021-08-04 11:12 BloggerSb 阅读(231) 评论(0) 推荐(0)