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一毛钱的年代 2021-09-14
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select * from students where age >=20 and sex = '男'
select * from students where sex= '女' order by student_id desc
select * from students where age between 17 and 19
select * from students where age >=20 and sex = '男'
select * from students where sex= '女' order by student_id desc
select * from students where age between 17 and 19
