创建表的操作
CREATE TABLE student(
id INT,
NAME VARCHAR(20),
chinese FLOAT,
english FLOAT,
math FLOAT
);
用创建的表
USE student;
插入数据
INSERT INTO student(id,NAME,chinese,english,math) VALUES(1,’张小明’,89,78,90);
INSERT INTO student(id,NAME,chinese,english,math) VALUES(2,’李进’,67,53,95);
INSERT INTO student(id,NAME,chinese,english,math) VALUES(3,’王五’,87,78,77);
INSERT INTO student(id,NAME,chinese,english,math) VALUES(4,’李一’,88,98,92);
INSERT INTO student(id,NAME,chinese,english,math) VALUES(5,’李来财’,82,84,67);
INSERT INTO student(id,NAME,chinese,english,math) VALUES(6,’张进宝’,55,85,45);
INSERT INTO student(id,NAME,chinese,english,math) VALUES(7,’黄蓉’,75,65,30);
1.查询表中所有学生的信息
SELECT * FROM student;
2.查询表中所有学生的姓名和对应的英语成绩
SELECT NAME,english FROM student;
3.统计每个学生的总分
SELECT chinese + english + math FROM student;
4.在所有学生总分数上加10分特长分
SELECT (chinese + english + math)+10 FROM student;
5.使用别名表示学生分数
SELECT (chinese + english + math) AS zongfen FROM student;
6.查询姓名为李一的学生成绩
SELECT chinese,english,math FROM student WHERE NAME=’李一’;
7.查询英语成绩大于90分的同学
SELECT NAME FROM student WHERE english>90;
8.查询总分大于200分的所有同学
SELECT NAME FROM student WHERE chinese+english+math>200;
9.查询英语分数在 80－90之间的同学
SELECT NAME FROM student WHERE english BETWEEN 80 AND 90;
10.查询数学分数为89,90,91的同学
SELECT NAME FROM student WHERE math IN(89,90,91);
11.查询所有姓李的学生英语成绩
SELECT english FROM student WHERE NAME LIKE’%李%’;
12.查询数学分>80并且语文分>80的同学
SELECT NAME FROM student WHERE math>80 AND chinese>80;
13.查询英语>80或者总分>200的同学
SELECT NAME FROM student WHERE english>80 OR chinese+english+math>200;
14.查询所有学生的成绩，按数学成绩降序输出
SELECT * FROM student ORDER BY math DESC;
15.对每个同学的总分排序后输出，然后再按从高到低的顺序输出
SELECT chinese+english+math AS zongfen FROM student ORDER BY zongfen DESC;
16.对姓李的学生总成绩升序输出
SELECT chinese+english+math AS zongfen FROM student WHERE NAME LIKE(‘李%’) ORDER BY zongfen ASC;