前段時間做sql注入的時候 使用group_concat時，出現標題上的錯誤。經查閱一位大佬的博客，成功解決！故寫此博文！
當mysql的sql_mode是only_full_group_by的時候，在不使用group by 並且select后面出現聚集函數的話，那么所有被select的都應該是聚集函數，否則就會報錯！
tips:在select指定的字段要么就要包含在group By語句的后面，作為分組的依據；要么就要被包含在聚合函數中。
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