mysql 数据库选定 创建 删除 变更

use db_name

select * from db_name.tbl_name

显示所有数据库

mysql> select schema_name from information_schema.schemata;

+--------------------+

| schema_name        |

+--------------------+

| information_schema |

| feng               |

| mysql              |

+--------------------+

3 rows in set (0.11 sec)

 

显示属于数据库feng的表

mysql> select table_name from information_schema.tables where table_schema='feng';

+------------+

| table_name |

+------------+

| feng       |

+------------+

1 row in set (0.05 sec)

 

数据库创建

create database db_name

create  database db_name if not exists db_name

create  database db_name if not exists db_name  character set utf8 collate utf8_icelandic_ci

show create database db_name\G

 

数据库删除

drop database db_name

drop database db_name if not exists db_name

 

数据库修改

alter database db_name default character set  utf8

                                          default collate  utf8_general_ci