MySQL基础篇：掌握数据库基本操作，轻松上手

查看和指定现有的数据库

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| bjpowernode        |
| eladmin            |
| mysql              |
| performance_schema |
| sqlalchemy         |
| sys                |
| test               |
+--------------------+
8 rows in set (0.04 sec)

指定当前缺省数据库

mysql> use bjpowernode;
Database changed
mysql>

查看当前使用的库

mysql> select database();
+-------------+
| database()  |
+-------------+
| bjpowernode |
+-------------+
1 row in set (0.08 sec)

查看当前库中的表

mysql> show tables;
+-----------------------+
| Tables_in_bjpowernode |
+-----------------------+
| DEPT                  |
| EMP                   |
| SALGRADE              |
+-----------------------+
3 rows in set (0.08 sec)

查看其他库中的表

show tables from ;

如查看test库中的表

mysql> show tables from test;
+----------------+
| Tables_in_test |
+----------------+
| DEPT           |
| EMP            |
| SALGRADE       |
| s1             |
| t1             |
| t2             |
| tx             |
+----------------+
7 rows in set (0.05 sec)

查看表的结构

​​desc​​​​<table name>;​​

mysql> desc EMP;
+----------+-------------+------+-----+---------+-------+
| Field    | Type        | Null | Key | Default | Extra |
+----------+-------------+------+-----+---------+-------+
| EMPNO    | int(4)      | NO   | PRI | NULL    |       |
| ENAME    | varchar(10) | YES  |     | NULL    |       |
| JOB      | varchar(9)  | YES  |     | NULL    |       |
| MGR      | int(4)      | YES  |     | NULL    |       |
| HIREDATE | date        | YES  |     | NULL    |       |
| SAL      | double(7,2) | YES  |     | NULL    |       |
| COMM     | double(7,2) | YES  |     | NULL    |       |
| DEPTNO   | int(2)      | YES  |     | NULL    |       |
+----------+-------------+------+-----+---------+-------+
8 rows in set (0.08 sec)

查看表的创建语句

​​show create table <table name>;​​

......
| EMP   | CREATE TABLE `EMP` (
  `EMPNO` int(4) NOT NULL,
  `ENAME` varchar(10) COLLATE utf8_bin DEFAULT NULL,
  `JOB` varchar(9) COLLATE utf8_bin DEFAULT NULL,
  `MGR` int(4) DEFAULT NULL,
  `HIREDATE` date DEFAULT NULL,
  `SAL` double(7,2) DEFAULT NULL,
  `COMM` double(7,2) DEFAULT NULL,
  `DEPTNO` int(2) DEFAULT NULL,
  PRIMARY KEY (`EMPNO`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin |
....