MySQL中表的基本操作1

（1）查看MySQL中存在的数据库

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

（2）创建数据库

 mysql> create database justforfun;
 Query OK, 1 row affected (0.08 sec)
 
 mysql> show databases;
 +--------------------+
 | Database           |
 +--------------------+
 | information_schema |
 | justforfun         |
 | mysql              |
 | performance_schema |
 | test               |
 +--------------------+
 5 rows in set (0.00 sec)

（3）删除数据库

 mysql> drop database justforfun;
 Query OK, 0 rows affected (0.33 sec)
 
 mysql> show databases;
 +--------------------+
 | Database           |
 +--------------------+
 | information_schema |
 | mysql              |
 | performance_schema |
 | test               |
 +--------------------+
 4 rows in set (0.00 sec)

（4）查看MySQL所支持的存储引擎

 mysql> show engines;
 +--------------------+---------+--------------------------------------------------
 
 ----------+--------------+------+------------+
 | Engine             | Support | Comment                                            
 
         | Transactions | XA   | Savepoints |
 +--------------------+---------+--------------------------------------------------
 
 ----------+--------------+------+------------+
 | MRG_MYISAM         | YES     | Collection of identical MyISAM tables              
 
         | NO           | NO   | NO         |
 | PERFORMANCE_SCHEMA | YES     | Performance Schema                                 
 
         | NO           | NO   | NO         |
 | InnoDB             | DEFAULT | Supports transactions, row-level locking, and 
 
 foreign keys | YES          | YES  | YES        |
 | CSV                | YES     | CSV storage engine                                 
 
         | NO           | NO   | NO         |
 | MyISAM             | YES     | MyISAM storage engine                              
 
         | NO           | NO   | NO         |
 | MEMORY             | YES     | Hash based, stored in memory, useful for temporary 
 
 tables  | NO           | NO   | NO         |
 +--------------------+---------+--------------------------------------------------
 
 ----------+--------------+------+------------+
 6 rows in set (0.04 sec)
 
 mysql> show engines \G
 *************************** 1. row ***************************
       Engine: MRG_MYISAM
      Support: YES
      Comment: Collection of identical MyISAM tables
 Transactions: NO
           XA: NO
   Savepoints: NO
 *************************** 2. row ***************************
       Engine: PERFORMANCE_SCHEMA
      Support: YES
      Comment: Performance Schema
 Transactions: NO
           XA: NO
   Savepoints: NO
 *************************** 3. row ***************************
       Engine: InnoDB
      Support: DEFAULT
      Comment: Supports transactions, row-level locking, and foreign keys
 Transactions: YES
           XA: YES
   Savepoints: YES
 *************************** 4. row ***************************
       Engine: CSV
      Support: YES
      Comment: CSV storage engine
 Transactions: NO
           XA: NO
   Savepoints: NO
 *************************** 5. row ***************************
       Engine: MyISAM
      Support: YES
      Comment: MyISAM storage engine
 Transactions: NO
           XA: NO
   Savepoints: NO
 *************************** 6. row ***************************
       Engine: MEMORY
      Support: YES
      Comment: Hash based, stored in memory, useful for temporary tables
 Transactions: NO
           XA: NO
   Savepoints: NO
 6 rows in set (0.00 sec)

（5）查看MySQL的默认引擎

 mysql> show variables like 'storage_engine';
 +----------------+--------+
 | Variable_name  | Value  |
 +----------------+--------+
 | storage_engine | InnoDB |
 +----------------+--------+
 1 row in set (0.00 sec)
 
 mysql>