SQL语句出错:select * from ad where AId=a13 order by 1 limit 1
    错误代码:#1054 - Unknown column 'a13' in 'where clause'
    SQL语句出错:select * from ad where AId=a15 order by 1 limit 1
    错误代码:#1054 - Unknown column 'a15' in 'where clause'
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