mysql常用操作之create、update、drop、truncate等 / 憋错料

[[email protected]_41_171_centos ~]# mysql -uroot -p

Enter password:

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 3713

Server version: 5.1.73 Source distribution

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.

mysql> show databases;

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

| Database |

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

| information_schema |

| mysql |

| test |

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

3 rows in set (0.00 sec)

mysql> use mysql;

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> show tables;

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

| Tables_in_mysql |

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

| columns_priv |

| db |

| event |

| func |

| general_log |

| help_category |

| help_keyword |

| help_relation |

| help_topic |

| host |

| ndb_binlog_index |

| plugin |

| proc |

| procs_priv |

| servers |

| slow_log |

| tables_priv |

| time_zone |

| time_zone_leap_second |

| time_zone_name |

| time_zone_transition |

| time_zone_transition_type |

| user |

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

23 rows in set (0.00 sec)

mysql> desc user;

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

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

| Host | char(60) | NO | PRI | | |

| User | char(16) | NO | PRI | | |

| Select_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Insert_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Update_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Delete_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Create_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Drop_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Reload_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Shutdown_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Process_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| File_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Grant_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| References_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Index_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Alter_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Show_db_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Super_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Create_tmp_table_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Lock_tables_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Execute_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Repl_slave_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Repl_client_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Create_view_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Show_view_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Create_routine_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Alter_routine_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Create_user_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Event_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Trigger_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| max_questions | int(11) unsigned | NO | | 0 | |

| max_updates | int(11) unsigned | NO | | 0 | |

| max_connections | int(11) unsigned | NO | | 0 | |

| max_user_connections | int(11) unsigned | NO | | 0 | |

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

39 rows in set (0.00 sec)

mysql> show create table user;

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

| Table | Create Table |

| user | CREATE TABLE `user` (

`Host` char(60) COLLATE utf8_bin NOT NULL DEFAULT ‘‘,

`User` char(16) COLLATE utf8_bin NOT NULL DEFAULT ‘‘,

`Password` char(41) CHARACTER SET latin1 COLLATE latin1_bin NOT NULL DEFAULT ‘‘,

`Select_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Insert_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Update_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Delete_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Create_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Drop_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Reload_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Shutdown_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Process_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`File_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Grant_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`References_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Index_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Alter_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Show_db_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Super_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Create_tmp_table_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Lock_tables_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Execute_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Repl_slave_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Repl_client_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Create_view_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Show_view_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Create_routine_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Alter_routine_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Create_user_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Event_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`Trigger_priv` enum(‘N‘,‘Y‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘N‘,

`ssl_type` enum(‘‘,‘ANY‘,‘X509‘,‘SPECIFIED‘) CHARACTER SET utf8 NOT NULL DEFAULT ‘‘,

`ssl_cipher` blob NOT NULL,

`x509_issuer` blob NOT NULL,

`x509_subject` blob NOT NULL,

`max_questions` int(11) unsigned NOT NULL DEFAULT ‘0‘,

`max_updates` int(11) unsigned NOT NULL DEFAULT ‘0‘,

`max_connections` int(11) unsigned NOT NULL DEFAULT ‘0‘,

`max_user_connections` int(11) unsigned NOT NULL DEFAULT ‘0‘,

PRIMARY KEY (`Host`,`User`)

) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT=‘Users and global privileges‘ |

1 row in set (0.00 sec)

mysql> select UNIX_TIMESTAMP();

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

| UNIX_TIMESTAMP() |

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

| 1460579152 |

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

1 row in set (0.00 sec)

mysql> select UNIX_TIMESTAMP() * 1000;

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

| UNIX_TIMESTAMP() * 1000 |

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

| 1460579158000 |

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

1 row in set (0.00 sec)

mysql> create database shawyang;

Query OK, 1 row affected (0.00 sec)

mysql> use shawyang;

Database changed

mysql> create table tb1 (`id` int(4), `name` char(40)) ENGINE=MyISAM DEFAULT CHARSET=gbk;

Query OK, 0 rows affected (0.01 sec)

mysql> desc tb1;

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

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

| id | int(4) | YES | | NULL | |

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

2 rows in set (0.00 sec)

mysql> show create table tb1\G;

*************************** 1. row ***************************

Table: tb1

Create Table: CREATE TABLE `tb1` (

`id` int(4) DEFAULT NULL,

`name` char(40) DEFAULT NULL

) ENGINE=MyISAM DEFAULT CHARSET=gbk

1 row in set (0.00 sec)

ERROR:

No query specified

mysql> insert into tb1 values(1, ‘shawyang‘);

Query OK, 1 row affected (0.00 sec)

mysql> insert into tb1 values(2, ‘51cto‘);

Query OK, 1 row affected (0.00 sec)

mysql> show create table tb1\G;

*************************** 1. row ***************************

Table: tb1

Create Table: CREATE TABLE `tb1` (

`id` int(4) DEFAULT NULL,

`name` char(40) DEFAULT NULL

) ENGINE=MyISAM DEFAULT CHARSET=gbk

1 row in set (0.00 sec)

ERROR:

No query specified

mysql> insert into tb1 (`id`) values(3);

Query OK, 1 row affected (0.00 sec)

mysql> insert into tb1 (`id`) values(4);

Query OK, 1 row affected (0.00 sec)

mysql> insert into tb1 (`name`) values(‘haha‘);

Query OK, 1 row affected (0.00 sec)

mysql> insert into tb1 (`name`, `id`) values("hehe", 6);

Query OK, 1 row affected (0.00 sec)

mysql> select * from tb1;

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

| id | name |

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

| 1 | shawyang |

| 2 | 51cto |

| 3 | NULL |

| 4 | NULL |

| NULL | haha |

| 6 | hehe |

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

6 rows in set (0.00 sec)

mysql> update tb1 set id=5 where name = ‘haha‘;

Query OK, 1 row affected (0.00 sec)

Rows matched: 1 Changed: 1 Warnings: 0

mysql> select * from tb1;

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

| id | name |

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

| 1 | shawyang |

| 2 | 51cto |

| 3 | NULL |

| 4 | NULL |

| 5 | haha |

| 6 | hehe |

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

6 rows in set (0.00 sec)

mysql> delete from tb1 where name = ‘hehe‘;

Query OK, 1 row affected (0.00 sec)

mysql> select * from tb1;

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

| id | name |

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

| 1 | shawyang |

| 2 | 51cto |

| 3 | NULL |

| 4 | NULL |

| 5 | haha |

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

5 rows in set (0.00 sec)

mysql> truncate table shawyang.tb1;

Query OK, 0 rows affected (0.00 sec)

mysql> select * from tb1;

Empty set (0.00 sec)

mysql> drop table tb1;

Query OK, 0 rows affected (0.00 sec)

mysql> show tables;

Empty set (0.00 sec)

mysql> drop database shawyang;

Query OK, 0 rows affected (0.00 sec)

mysql> show databases;

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

| Database |

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

| information_schema |

| mysql |

| test |

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

3 rows in set (0.00 sec)

mysql> exit

Bye

[[email protected]_41_171_centos ~]# exit

logout

时间： 2024-10-15 02:39:21

mysql常用操作之create、update、drop、truncate等

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