ORDER BY 子句中的列必須包含在聚合函數或 GROUP BY 子句中。
slect * from table group by class,id order by id
slect * from table group by class,id order by class
ORDER BY 子句中的列必須包含在聚合函數或 GROUP BY 子句中。
slect * from table group by class,id order by id
slect * from table group by class,id order by class
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