ICode9

-- left join 以左表为主表 匹配右表中的数据select * from table1 ll left join( select * from table1_his ) hison ll.sbbh = his.sbbh -- union all 合并结果集 union 取出两个表中不重复的列select * from(select his.sbbh from table1_his hisunionselect ll.sbbh from tabl