MySQL單表操作面試題

1. 求所有學生科目分數高於80分的學生姓名及成績。 結果： select name,chengji from t_table group by name having min(chengji) > 80 2.按年月分別展示數據 select year, sum(case when month = 1 then mon else 0 end) as m1, sum(case when month

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