创建表
create table stu_grade(name varchar(20),course varchar(20),grade int);
插入数据
INSERT INTO stu_grade VALUES ('张三', '语文', '81');
INSERT INTO stu_grade VALUES ('张三', '数学', '75');
INSERT INTO stu_grade VALUES ('李四', '语文', '76');
INSERT INTO stu_grade VALUES ('李四', '数学', '90');
INSERT INTO stu_grade VALUES ('王五', '语文', '81');
INSERT INTO stu_grade VALUES ('王五', '数学', '100');
INSERT INTO stu_grade VALUES ('王五', '英语', '90');
题1:使用SQL语句查询每门课程都大于80分的学生姓名
方法一:
select name from stu_grade group by name having MIN(grade)>80
方法二:
select distinct name from stu_grade where name not in (select distinct name from stu_grade where grade <=80)
题2:使用SQL语句查询每门课程和大于240分的学生姓名
select name from stu_grade group by having SUM(grade)>240
提3:mysql取出stu_grade中的3到7行
select * from stu_grade limit 3,7;