Linux_mysql基础命令

一、基本命令
1.1 查看所有数据库：show databases;

1.2 查看当前所在的库：select database();

1.4 切换数据库：use database;

1.5 查看所有表：show tables;

1.6 创建数据库 create database ku_name charset=utf8;

1.7 创建表：create table table_name(id int primary key auto_increment, name varchar(10),age int );


default：设置默认值

mysql> create table table_name1
    -> (
    -> id int primary key auto_increment,
    -> name varchar(10),
    -> age int default 20
    -> )
    -> ;
Query OK, 0 rows affected (0.09 sec)

'''查看表约束'''
mysql> desc table_name1;
+-------+-------------+------+-----+---------+----------------+
| Field | Type        | Null | Key | Default | Extra          |
+-------+-------------+------+-----+---------+----------------+
| id    | int(11)     | NO   | PRI | NULL    | auto_increment |
| name  | varchar(10) | YES  |     | NULL    |                |
| age   | int(11)     | YES  |     | 20      |                |
+-------+-------------+------+-----+---------+----------------+
3 rows in set (0.00 sec)

1.8 向表中插入数据：insert into table_name values (),() ;

1.9 查看表信息：desc table_name

2.0 查看表里的所有信息：select * from table_name