mysql数据库增删改查

mysql数据库增删改查

1.如何在数据库服务器中创建服务器

• create database 数据库名字；

2.如何在数据库中创建一个数据表

create table pet(
    -> name varchar(20),
    -> owner varchar(20),
    -> species varchar(20),
    -> sex char(1),
    -> birth date,
    -> death date);

3.查看数据表

• show tables；

mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| pet            |
+----------------+
1 row in set (0.03 sec)

4.查看数据表结构

• describe pet;

mysql> describe pet;
+---------+-------------+------+-----+---------+-------+
| Field   | Type        | Null | Key | Default | Extra |
+---------+-------------+------+-----+---------+-------+
| name    | varchar(20) | YES  |     | NULL    |       |
| owner   | varchar(20) | YES  |     | NULL    |       |
| species | varchar(20) | YES  |     | NULL    |       |
| sex     | char(1)     | YES  |     | NULL    |       |
| birth   | date        | YES  |     | NULL    |       |
| death   | date        | YES  |     | NULL    |       |
+---------+-------------+------+-----+---------+-------+

5.查看数据表中的记录

select * from pet;

6.向数据表里添加记录

insert into pet
    -> values('Puffball','Diane','hamster','f','1999-03-10',NULL);

7.再一次查看数据表中的记录(手残，添加了两次)

select * from pet;

+----------+-------+---------+------+------------+-------+
| name     | owner | species | sex  | birth      | death |
+----------+-------+---------+------+------------+-------+
| Puffball | Diane | hamster | f    | 1999-03-10 | NULL  |
| Puffball | Diane | hamster | f    | 1999-03-10 | NULL  |
+----------+-------+---------+------+------------+-------+

8.向数据表里删除记录

delete from pet where name='Puffball';

9.向数据表里修改记录

首先 看一下数据表的信息

select * from pet;

+--------+----------+---------+------+------------+------------+
| name   | owner    | species | sex  | birth      | death      |
+--------+----------+---------+------+------------+------------+
| Douya  | Feifei   | jinmao  | f    | 2007-10-15 | NULL       |
| Fluffy | Harold   | cat     | f    | 1996-09-10 | NULL       |
| claws  | giv      | cat     | m    | 1978-06-14 | NULL       |
| nini   | gary     | dog     | m    | 1995-07-14 | 1999-04-08 |
| doubao | yangyang | dog     | f    | 2010-08-14 | NULL       |
| BAOBAO | DQING    | dog     | m    | 2014-04-28 | NULL       |
+--------+----------+---------+------+------------+------------+
6 rows in set (0.00 sec)

接下来 update pet set name='NiNi' where owner='gary';

再来查看select * from pet;

+--------+----------+---------+------+------------+------------+
| name   | owner    | species | sex  | birth      | death      |
+--------+----------+---------+------+------------+------------+
| Douya  | Feifei   | jinmao  | f    | 2007-10-15 | NULL       |
| Fluffy | Harold   | cat     | f    | 1996-09-10 | NULL       |
| claws  | giv      | cat     | m    | 1978-06-14 | NULL       |
| NiNi   | gary     | dog     | m    | 1995-07-14 | 1999-04-08 |
| doubao | yangyang | dog     | f    | 2010-08-14 | NULL       |
| BAOBAO | DQING    | dog     | m    | 2014-04-28 | NULL       |
+--------+----------+---------+------+------------+------------+

总结自 [code158编程俱乐部]http://www.code158.com mysql编程系列教程