当时只道是寻常呀

摘要： 上图最下面两个图的查询语句 select ... from 表1 as a FULL OUTER JOIN 表2 as b on a.列名=b.列名 （右） select ... from 表1 as a FULL OUTER JOIN 表2 as b on a.列名=b.列名 where a.列名 阅读全文