标签:mysql语句
二、常用SQL语句
库 -- >表 -- >行 -- >字段
■库操作
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mysql> show databases; #查看本地库 +--------------------+ | Database | +--------------------+ | information_schema | | mysql | | performance_schema | | test | +--------------------+ 4 rows in set (0.08 sec)
mysql> use mysql #切换库 Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed
mysql> select database(); #查看当前库 +------------+ | database() | +------------+ | mysql | +------------+ 1 row in set (0.00 sec)
mysql> select version(); #查看当前数据库版本 +-----------+ | version() | +-----------+ | 5.6.28 | +-----------+ 1 row in set (0.00 sec)
mysql> create database szk; #创建一个szk库 Query OK, 1 row affected (0.02 sec)
mysql> drop database szk; #删除库 Query OK, 0 rows affected (0.00 sec)
■表操作
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mysql> show tables; #查看当前库中的表 +---------------------------+ | Tables_in_mysql | +---------------------------+ | columns_priv | | db | | event | | func | | general_log | | help_category | | help_keyword |
mysql> desc user; #查看当前表的字段 +------------------------+-----------------------------------+------+-----+-----------------------+-------+ | Field | Type | Null | Key | Default | Extra | +------------------------+-----------------------------------+------+-----+-----------------------+-------+
mysql> insert into tb1 values(1, ‘szk‘); #插入语句1 Query OK, 1 row affected (0.01 sec) mysql> select * from tb1; #查看表中语句 +------+------+ | id | name | +------+------+ | 1 | szk | +------+------+ 1 row in set (0.00 sec)
mysql> truncate table tb1; #清空这个表 Query OK, 0 rows affected (0.00 sec) mysql> drop table tb1; #删除这个表 Query OK, 0 rows affected (0.00 sec) mysql> create table tb1 (`id` int(4), `name` char(40)) ENGINE=MyISAM DEFAULT CHARSet=gbk; #创建一个表,表名为tb1,并且有俩语句,编码为gbk Query OK, 0 rows affected (0.02 sec)
mysql> desc tb1; #查看当前表中字段 +-------+----------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+----------+------+-----+---------+-------+ | id | int(4) | YES | | NULL | | | name | char(40) | YES | | NULL | | +-------+----------+------+-----+---------+-------+ 2 rows in set (0.00 sec)
■权限操作
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[root@lab-1-C6 ~]# mysqladmin -uroot password ‘111qqq...‘ #给root用户设置密码 语法: CREATE USER ‘username‘@‘host‘ IDENTIFIED BY ‘password‘; mysql> create user szk5043@192.168.1.201 identified by ‘szk5043‘; #创建一个mysql登录用户,通过identified设定密码,并且限制用户只能从指定的主机登录 mysql> Drop user szk5043; #删除用户 语法: grant 权限1,权限2,...权限n on 数据库名称.表名称 to 用户名@用户地址 identified by ‘连接口令‘; select,insert,update,delete,create,drop,index,alter,grant,references,reload,shutdown,process,file等14个权限 mysql>grant all privileges on *.* to szk5043@192.168.1.201 identified by ‘szk5043‘; 给szk5043分配可对所有数据库的所有表进行所有操作的权限,并设定口令为szk5043 mysql>flush privileges; #刷新系统权限表
■查看操作
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mysql> show variables; #查看进程 mysql> show status; #查看状态 mysql> show status like ‘%running‘; #查看单个对象状态 +-----------------+-------+ | Variable_name | Value | +-----------------+-------+ | Slave_running | OFF | | Threads_running | 1 | +-----------------+-------+ 2 rows in set (0.00 sec) mysql> repair table discuz.pre_forum_port; #修复表 +-----------------------+--------+----------+---------------------------------------------+ | Table | Op | Msg_type | Msg_text | +-----------------------+--------+----------+---------------------------------------------+ | discuz.pre_forum_port | repair | Error | Table ‘discuz.pre_forum_port‘ doesn‘t exist | | discuz.pre_forum_port | repair | status | Operation failed | +-----------------------+--------+----------+---------------------------------------------+
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标签:mysql语句
原文地址:http://szk5043.blog.51cto.com/8456440/1762961