本文共 4880 字，大约阅读时间需要 16 分钟。

MariaDB [mysql]> create database test;		/创建数据库Query OK, 1 row affected (0.00 sec)MariaDB [(none)]> show databases;	、查看数据库+--------------------+| Database           |+--------------------+| information_schema || mysql              || performance_schema || test               |+--------------------+4 rows in set (0.00 sec)MariaDB [mysql]> use test;	/切换位置Database changedMariaDB [test]> create table linux (user varchar(30) not null,passwd varchar(20) not null,sex varchar(4) not null);Query OK, 0 rows affected (0.01 sec)MariaDB [test]> show table;ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 1MariaDB [test]> MariaDB [test]> show tables;+----------------+| Tables_in_test |+----------------+| linux          |+----------------+1 row in set (0.00 sec)\MariaDB [test]> desc linux;		、查看表结构+--------+-------------+------+-----+---------+-------+| Field  | Type        | Null | Key | Default | Extra |+--------+-------------+------+-----+---------+-------+| user   | varchar(30) | NO   |     | NULL    |       || passwd | varchar(20) | NO   |     | NULL    |       || sex    | varchar(4)  | NO   |     | NULL    |       |+--------+-------------+------+-----+---------+-------+3 rows in set (0.00 sec)MariaDB [test]> show columns from linux;		/作用和desc 相同+--------+-------------+------+-----+---------+-------+| Field  | Type        | Null | Key | Default | Extra |+--------+-------------+------+-----+---------+-------+| user   | varchar(30) | NO   |     | NULL    |       || passwd | varchar(20) | NO   |     | NULL    |       || sex    | varchar(4)  | NO   |     | NULL    |       |+--------+-------------+------+-----+---------+-------+3 rows in set (0.00 sec)MariaDB [(none)]> SHOW CREATE DATABASE test;+----------+-----------------------------------------------------------------+| Database | Create Database                                                 |+----------+-----------------------------------------------------------------+| test     | CREATE DATABASE `test` /*!40100 DEFAULT CHARACTER SET latin1 */ |+----------+-----------------------------------------------------------------+1 row in set (0.01 sec)MariaDB [test]> show create table linux;	分别用来显示创建特定数据库或表的MySQL语句；+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------+| Table | Create Table                                                                                                                                              |+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------+| linux | CREATE TABLE `linux` (  `user` varchar(30) NOT NULL,  `passwd` varchar(20) NOT NULL,  `sex` varchar(4) NOT NULL) ENGINE=InnoDB DEFAULT CHARSET=latin1 |+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------+SHOW STATUS，用于显示广泛的服务器状态信息；SHOW GRANTS，用来显示授予用户（所有用户或特定用户）的安全权限；SHOW ERRORS和SHOW WARNINGS，用来显示服务器错误或警告消息。MariaDB [test]> show grants;+---------------------------------------------------------------------+| Grants for root@localhost                                           |+---------------------------------------------------------------------+| GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' WITH GRANT OPTION || GRANT PROXY ON ''@'' TO 'root'@'localhost' WITH GRANT OPTION        |+---------------------------------------------------------------------+2 rows in set (0.00 sec)MariaDB [test]> show ERRORS;Empty set (0.01 sec)MariaDB [test]> show WARNING;ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'WARNING' at line 1MariaDB [test]> show WARNINGS;+-------+------+-------------------------------------------------------------------------------------------------------------------------------------------------------------+| Level | Code | Message                                                                                                                                                     |+-------+------+-------------------------------------------------------------------------------------------------------------------------------------------------------------+| Error | 1064 | You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'WARNING' at line 1 |+-------+------+-------------------------------------------------------------------------------------------------------------------------------------------------------------+1 row in set (0.00 sec)

转载地址：http://luxli.baihongyu.com/