＞ 1248 - Every derived table must have its own alias mysql

1248 - Every derived table must have its own alias 报错
一般是由于union后产生了虚拟表，但没有进行定义
错误sql如下：

SELECT*
FROM((SELECTgaform_lpt_30.file_id file_id,gaform_lpt_30.gettime gettime FROM`gaform_lpt_30` WHEREallagree = 1 ) UNION ALL(SELECTgaform_lpt_29.file_id file_id,gaform_lpt_29.gettime gettime FROM`gaform_lpt_29` WHEREallagree = 1 ) )
ORDER BYt.gettime DESC

修改后的代码

SELECT*
FROM((SELECTgaform_lpt_30.file_id file_id,gaform_lpt_30.gettime gettime FROM`gaform_lpt_30` WHEREallagree = 1 ) UNION ALL(SELECTgaform_lpt_29.file_id file_id,gaform_lpt_29.gettime gettime FROM`gaform_lpt_29` WHEREallagree = 1 ) ) AS t
ORDER BYt.gettime  DESC

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＞ 1248 - Every derived table must have its own alias mysql

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