CREATE DATABASE IF NOT EXISTS mydb;
USE mydb;
CREATE TABLE IF NOT EXISTS student(
id INT,                     
NAME VARCHAR(20),
gender VARCHAR(2),                        
age INT,
birth DATE,
address VARCHAR(20),
score DOUBLE
);

-- 指定添加
INSERT INTO student(id,NAME,gender,age,birth,address,score)
         VALUES(1000,'张三','男',18,'2001-12-23','北京',86.5);
INSERT INTO student(id,NAME,gender,age,birth,address,score)
         VALUES(1001,'李四','男',19,'2002-9-13','上海',76.5),
           (1002,'王五','女',17,'2003-11-29','深圳',66.5);
INSERT INTO student(id) VALUES(1003);
INSERT INTO student(id,NAME) VALUES(1004,'赵六');
-- 全部添加 
INSERT INTO student VALUES(1005,'孙七','男',20,'2004-12-21','南京',96.5);
-- 全部修改 
UPDATE student SET address = '重庆';
-- 指定修改 
UPDATE student SET address = '北京' WHERE id = 1004;
UPDATE student SET address = '南京' WHERE id > 1002;
-- 指定删除 
DELETE FROM student WHERE id = 1003;
-- 删除表中所有数据 
DELETE FROM student;
-- 清空表中数据 
TRUNCATE student;