ERROR 1055 (42000): Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregate

在mysql 5.7初次使用group by時會出現錯誤,首先表信息如下:        ERROR 1055 (42000): Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column ‘test.score.id’ which is not functionally depe
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