4.搜素资料
-- 取得资料
-- 取得全部
SELECT * FROM student;
-- 取得部分
SELECT `name` FROM `student`;
select *
from `student`
order by `score` desc;
select *
from `student`
order by `score`,`student_id`;
select *
from `student`
order by `score`,`student_id`
limit 3;
select *
from `student`
where `major` = '英语';
select *
from `student`
where `student_id` <> 2;
select *
from `student`
where `major` in('英语','历史');
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