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数据库第一章 MySql基础（2）

news 来源：原创 2025/5/7 1:09:56

MYSQL

DML

插入数据

修改数据

删除数据

实例

MYSQL

DML

数据操纵语言（Data Manipulation Language）
常用语句： insert,delete,update

插入数据

方式1:

INSERT INTO 表名(列1,列2……,列n) VALUES(值1,值2…..,值n);

-- 方法1：INTSERT INTO 表名(列1，列2.....，列n) VALUES(值1，值2......，值n);
INSERT INTO student(num,NAME,gender,phone,birthday,height,retime)
            VALUE(100,'张三','男','14566666','2005-07-01',1.88,NOW())

方式2:

INSERT INTO 表名 set 列名1=值1,..列名n=值n;

-- 方法2：INTSERT INTO 表名 set列名1=值1，。。。，列名n=值n;
INSERT INTO student SET num='101',NAME='影',gender='女',phone='19223333',rgtime=NOW()

方式3:

INSERT INTO 表名(列1,列2……,列n) VALUES(值1,值2…..,值n),(值1,值2…..,值n);

-- 方式3:INSERT INTO 表名(列1,列2.,列n)VALUES(值1,值2....,值n) ，(值1,值2...,值n);批量插入
-- 批量插入
INSERT INTO student(num,NAME,phone,regtime)
VALUES(102,'jim','11111',NOW()),
(103,'tom','222',NOW()),
(104,'jery','3333',NOW())

修改数据

UPDATE 表名 SET 列名 = ‘值’,列名 = ‘值’ WHERE 条件

-- update
UPDATE student SET birthday='2000-1-1',height=1.89 -- 没有条件的修改，注意没有条件会修改表中所有数据
UPDATE student SET birthday='2000-1-12',height=1.78 WHERE  id=8

删除数据

DELETE FROM 表名 WHERE 条件 TRUNCATE TABLE 表名;
清空整张表建议使用

实例

-- 创建球员信息表和球队信息表
CREATE TABLE basketballTeam(
id INT PRIMARY KEY AUTO_INCREMENT COMMENT'逐渐',
teamName VARCHAR(4)NOT NULL COMMENT'球队名称',
address CHAR(5)NOT NULL COMMENT'所在地'
)
CREATE TABLE basketballplayer(
id INT PRIMARY KEY AUTO_INCREMENT COMMENT'主键',
NAME VARCHAR(10) NOT NULL COMMENT'名字' ,
birthday DATE  COMMENT'生日',
height INT CHECK(height<250) COMMENT'身高',
weight INT CHECK(weight<150) COMMENT'体重',
POSITION CHAR(4)COMMENT'位置'
)
-- 使用dml语句,完成对球员,球队信息的添加,删除,修改操作
INSERT INTO basketballTeam(teamName,address)
VALUES('湖人','洛杉矶'),
('火箭','休斯顿'),
('凯尔特人','波斯顿'),
('骑士','克利夫兰'),
('马刺','圣安东尼奥'),
('魔术','奥兰多')
INSERT INTO basketballplayer(NAME,POSITION)
VALUES('德怀恩-韦德',NULL),
      ('勒布朗-詹姆斯','前锋'),
      ('科比-布莱恩特','后卫'),
      ('德克-诺维茨基',NULL),
      ('克里斯-保罗','后卫'),
      ('托尼-帕克','后卫'),
      ('凯文-加内特',NULL),
      ('保罗-皮尔斯','前锋'),
      ('迈克尔-乔丹',NULL),
      ('德怀特-霍华德','中锋'),
      ('姚明','中锋'),
      ('沙奎尔-奥尼尔','中锋')
      UPDATE basketballplayer SET birthday='1982-1-17', height=193, weight=96 WHERE id=1;
      UPDATE basketballplayer SET birthday='1984-12-30',height=203,weight=113 WHERE id=2;
      UPDATE basketballplayer SET birthday='1978-8-23',height=198,weight=99 WHERE id=3;
      UPDATE basketballplayer SET birthday='1978-6-19',height=213,weight=111 WHERE id=4;
      UPDATE basketballplayer SET birthday='1985-5-6',height=182,weight=79 WHERE id=5;
      UPDATE basketballplayer SET birthday='1982-5-17',height=187,weight=83 WHERE id=6;
      UPDATE basketballplayer SET birthday='1981-7-4',height=212,weight=113 WHERE id=7;
      UPDATE basketballplayer SET birthday='1977-10-13',height=200,weight=106 WHERE id=8;
      UPDATE basketballplayer SET birthday='1963-2-17',height=198,weight=98 WHERE id=9;
      UPDATE basketballplayer SET birthday='1985-12-8',height=210,weight=120 WHERE id=10;
      UPDATE basketballplayer SET birthday='1980-9-12',height=229,weight=140 WHERE id=11;
      UPDATE basketballplayer SET birthday='1972-3-6',height=215,weight=147 WHERE id=12;