Mysql从UNION ALL查询结果集中查询对应列出现错误"Every derived table must have its own alias"

在使用UNION ALL联合表的时候出现了出现了Every derived table must have its own alias 错误html sql以下:sql SELECT * FROM (SELECT 1 CorpLevel,t.Operator_Id CorpId,t.Operator_Name CorpName,'1' CorpType FROM Fd_Operator
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