测试常用基础sql语句

增

insert into student values(null,'meimei','女',2)

删

delete from student where name='meimei'

改

update student set name='田梅' where stu_id='2'

查

SELECT * FROM `student`

select stu_id,name from `student`

select * from student t1 inner join stu_score t2 on t1.stu_id=t2.stu_id

select subject_name,count(*) from student t1 inner join stu_score t2 on t1.stu_id=t2.stu_id group by subject_name

select * from student t1
inner join stu_score t2 on t1.stu_id=t2.stu_id where subject_name='数学'

select * from student t1
inner join stu_score t2 on t1.stu_id=t2.stu_id where subject_name='数学' order by score asc

select * from student t1 inner join stu_score t2 on t1.stu_id=t2.stu_id where score=90