SQL查询笔记（行转列）

有两张表 1.查询所有性别的同学成绩都为优 select name, subject, scope, case sex when 1 then ‘男’ when 2 then ‘女’ else ‘其它’ end sex, ‘优’ level from test left join student on test.student_id=student.id 2.查询各成绩段显示的级别 select

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