每一个派生表必须有它自己的别名（Every derived table must have its own alias）
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每一个派生表都必须给其取个别名
如:
select * from (select * from table_a union select * from table_b)
解决办法：
select * from (select * from table_a union select * from table_b)c
解决办法：
select * from (select * from table_a union select * from table_b)c
如果不加上这个别名,就会出现异常
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