数据库三级考试的随笔3.0

1 select name,grade,评价= 2 case 3 when grade >90 then '优秀' 4 when grade between 80 and 90 then '中等' 5 when grade <80 then '垃圾' 6 end 7 from student 这个就是运行结果   1 select name,sex into 性别表格 2 from studen

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