这是因为使用union的两个SQL语句产生的记录的表结构不一致. 必须是结构完全一致的记录集合才可以使用UNION.
以上就是两个表的字段不一样，导致，所以大家可以检查下。
sql语句遇到错误： The used SELECT statements have a different number of columns :
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