[Err] 1248 - Every derived table must have its own alias
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在mysql里 驱动表必须定义别名，不然报错，如下查询格式：
select * from (
select * from tablename union
select * from tablename )m
where .......
在上面的这个查询里，红色部分外必须定义表别名m ，不然就报错，[Err] 1248 - Every derived table must have its own alias。
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- 错误代码： 1248 Every derived table must have its own alias
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