MySQL插入更新删除数据

CREATE TABLE person

(

id INT UNSIGNED NOT NULL AUTO_INCREMENT,

name CHAR(40) NOT NULL DEFAULT '',

age INT NOT NULL DEFAULT 0,

info CHAR(50) NULL,

PRIMARY KEY (id)

);

select * from person;

insert into person (id,name,age,info) values (1,'Green',21,'Lawyer');

select * from person;

insert into person (id,name,age,info) values (2,'Suse',2,'dance');

select * from person;

INSERT INTO person VALUES (3,'Mary', 24, 'Musician');

select * from person;

INSERT INTO person (name, age,info)

VALUES('Willam', 20, 'sports man');

select * from person;

INSERT INTO person (name, age ) VALUES ('Laura', 25);

select * from person;

INSERT INTO person(name, age, info)

VALUES ('Evans',27, 'secretary'),

('Dale',22, 'cook'),

('Edison',28, 'singer');

select * from person;

INSERT INTO person

VALUES (9,'Harry',21, 'magician'),

(NULL,'Harriet',19, 'pianist');

CREATE TABLE person_old

(

id INT UNSIGNED NOT NULL AUTO_INCREMENT,

name CHAR(40) NOT NULL DEFAULT '',

age INT NOT NULL DEFAULT 0,

info CHAR(50) NULL,

PRIMARY KEY (id)

);

INSERT INTO person_old VALUES (10,'Harry',20, 'student'), (11,'Beckham',31, 'police');

select * from person_old;

INSERT INTO person(id, name, age, info)

SELECT id, name, age, info FROM person_old;

select * from person;

更新数据

select * from person where id=10;

UPDATE person SET age = 15, name='LiMing' WHERE id = 10;

select * from person where id=10;

update person set info='student' where age between 19 and 22;

select * from person where age between 19 and 22;

删除数据

select * from person where id=10;

delete from person where id=10;

delete from person where age between 19 and 22;

select * from person where age between 19 and 22;

delete from person;

select * from person;

CREATE TABLE person

(

id INT UNSIGNED NOT NULL AUTO_INCREMENT,

name CHAR(40) NOT NULL DEFAULT '',

age INT NOT NULL DEFAULT 0,

info CHAR(50) NULL,

PRIMARY KEY (id)

);

【例.1】在person表中，插入一条新记录，id值为3，name值为Green，age值为21，SQL语句如下：

INSERT INTO person (id ,name, age , info) VALUES (1,'Green', 21, 'Lawyer');

【例.2】在person表中，插入一条新记录，id值为4，name值为Suse，age值为22，info值为dancer，SQL语句如下：

INSERT INTO person (age ,name, id , info)

VALUES (22, 'Suse', 2, 'dancer');

【例.3】在person表中，插入一条新记录，name值为Mary，age值为24，SQL语句如下：

INSERT INTO person

VALUES (3,'Mary', 24, 'Musician');

【例.4】在person表中，插入一条新记录，name值为Willam，age值为20，info值为sports man，SQL语句如下：

INSERT INTO person (name, age,info)

VALUES('Willam', 20, 'sports man');

【例.5】在person表中，插入一条新记录，name值为laura，age值为25，SQL语句如下：

INSERT INTO person (name, age ) VALUES ('Laura', 25);

【例.6】在person表中，在name、age和info字段指定插入值，同时插入3条新记录，SQL语句如下：

INSERT INTO person(name, age, info)

VALUES ('Evans',27, 'secretary'),

('Dale',22, 'cook'),

('Edison',28, 'singer');

【例.7】在person表中，不指定插入列表，同时插入2条新记录，SQL语句如下：

INSERT INTO person

VALUES (9,'Harry',21, 'magician'),

(NULL,'Harriet',19, 'pianist');

【例.8】从person_old表中查询所有的记录，并将其插入到person表中，过程如下：

首先，创建一个名为person_old的数据表，

CREATE TABLE person_old

(

id INT UNSIGNED NOT NULL AUTO_INCREMENT,

name CHAR(40) NOT NULL DEFAULT '',

age INT NOT NULL DEFAULT 0,

info CHAR(50) NULL,

PRIMARY KEY (id)

);

向person_old表中添加两条记录：

INSERT INTO person_old

VALUES (10,'Harry',20, 'student'), (11,'Beckham',31, 'police');

将查询结果插入到表中

INSERT INTO person(id, name, age, info)

SELECT id, name, age, info FROM person_old;

【例.9】在person表中，更新id值为10的记录，将age字段值改为15，将name字段值改为LiMing，SQL语句如下：

UPDATE person SET age = 15, name=’LiMing’ WHERE id = 10;

【例.10】在person表中，更新age值为19到22的记录，将info字段值都改为student，SQL语句如下：

UPDATE person SET info=’student’ WHERE id BETWEEN 19 AND 22;

【例.11】在person表中，删除id等于10的记录，SQL语句如下：

DELETE FROM person WHERE id = 10;

【例.12】在person表中，使用DELETE语句同时删除多条记录，在前面UPDATE语句中将age字段值在19到22之间的记录的info字段值修改为student，在这里删除这些记录，SQL语句如下：

DELETE FROM person WHERE age BETWEEN 19 AND 22;

【例.13】删除person表中所有记录，SQL语句如下：

DELETE from person;