Mysql----基础操作

Posted 2021-02-27 我是谁9

• 创建数据库：create Database database_name

mysql> create Database test2;
Query OK, 1 row affected (0.00 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
| test               |
| test2              |
+--------------------+
6 rows in set (0.00 sec)

• 查看数据库：show databases;

mysql> create Database test2;
Query OK, 1 row affected (0.00 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
| test               |
| test2              |
+--------------------+
6 rows in set (0.00 sec)

• 选择数据库：use database_name

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
| test               |
| test2              |
+--------------------+
6 rows in set (0.00 sec)

mysql> use information_schema;
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 #表示选择数据库成功

• 删除数据库：DROP DATABASE database_name

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
| test               |
| test2              |
+--------------------+
6 rows in set (0.00 sec)

mysql> drop database test;
Query OK, 0 rows affected (0.00 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
| test2              |
+--------------------+
5 rows in set (0.00 sec)

• 查询默认存储引擎：SHOW VARIABLES LIKE ‘storage_engine%‘;

mysql> show variables like ‘storage_engine%‘;
Empty set (0.01 sec)