3-28 MySQL 增删改

CREATE TABLE student(
id int(4) NOT NULL PRIMARY key     auto_increment,
`name` VARCHAR(20) NOT NULL DEFAULT ‘匿名‘,
sex VARCHAR(2) NOT null DEFAULT ‘1‘,
phone BIGINT(11),
role int(2),
score int(4)

)

INSERT INTO student 
VALUES (DEFAULT,‘zhangsan‘,2,13837689458,1,54);
INSERT INTO student 
VALUES (DEFAULT,‘lisi‘,2,18888888888,2,90);
INSERT INTO student 
VALUES (DEFAULT,‘wangwu‘,1,16666666666,3,94);
INSERT INTO student 
VALUES (DEFAULT,‘zhaoliu‘,2,15555555555,3,82);

UPDATE student SET Phone=18650170763 WHERE id=2;

SELECT*FROM student WHERE score<60;

SELECT* FROM student WHERE name LIKE‘z%‘;

SELECT * FROM student WHERE role IN (1,3);
DELETE FROM student WHERE role=1;

DELETE FROM student;