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a
union all
b
如果a中有order by则报错
order by写在b后面才正确
而且 排序的字段均需要在a,b中都查询出来,如果a,b中不查询出c1,按照order by c1会报错(unknow column 'c1')
如果不用union,只有a或b,即使不查询出c1,按照order by c1不会报错
(c1是表的字段名)
Mysql版本:5.6.38-log