mysql数据库学习――2，数据库的选定，创建，删除和变更_MySQL

use db_nameselect * from db_name.tbl_name

mysql> select schema_name from information_schema.schemata;+--------------------+| schema_name        |+--------------------+| information_schema || feng               || mysql              |+--------------------+3 rows in set (0.11 sec)

mysql> select table_name from information_schema.tables where table_schema='feng';+------------+| table_name |+------------+| feng       |+------------+1 row in set (0.05 sec)

create database db_namecreate  database db_name if not exists db_namecreate  database db_name if not exists db_name  character set utf8 collate utf8_icelandic_cishow create database db_name/G

drop database db_namedrop database db_name if not exists db_name

alter database db_name default character set  utf8                                          default collate  utf8_general_ci