數據庫三級考試的隨筆3.0

1 select name,grade,評價= 2 case 3 when grade >90 then '優秀' 4 when grade between 80 and 90 then '中等' 5 when grade <80 then '垃圾' 6 end 7 from student 這個就是運行結果   1 select name,sex into 性別表格 2 from studen

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