select03.sql

-- select 语句
-- 查询姓名为赵云的学生成绩
SELECT * FROM student 
	WHERE `name` = '赵云'
-- 查询英语成绩大于90分的同学
SELECT * FROM student 
	WHERE english > 90
-- 查询总分大于200分的所有同学

SELECT * FROM student 
	WHERE (chinese + english + math) > 200
	
-- 查询math大于60 并且(and) id大于4的学生成绩
SELECT * FROM student
	WHERE math >60 AND id > 4
-- 查询英语成绩大于语文成绩的同学
SELECT * FROM student
	WHERE english > chinese
-- 查询总分大于200分 并且 数学成绩小于语文成绩,的姓赵的学生.
-- 赵% 表示 名字以赵开头的就可以
SELECT * FROM student
	WHERE (chinese + english + math) > 200 AND 
		math < chinese AND `name` LIKE '赵%'
-- 查询英语分数在 80－90之间的同学。
SELECT * FROM student
	WHERE english >= 80 AND english <= 90;
SELECT * FROM student
	WHERE english BETWEEN 80 AND 90; -- between .. and .. 是 闭区间
-- 查询数学分数为89,90,91的同学。
SELECT * FROM student 
	WHERE math = 89 OR math = 90 OR math = 91;
SELECT * FROM student 
	WHERE math IN (89, 90, 91);
-- 查询所有姓李的学生成绩。
SELECT * FROM student 
	WHERE `name` LIKE '韩%'
-- 查询数学分>80，语文分>80的同学