数据库的基本操作

时间：2020-04-14 16:48:09 阅读：76 评论：0 收藏：0 [点我收藏+]

标签：hive red nes isa value character null def error

创建数据库
mysql> SHOW DATABASES;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
4 rows in set (0.35 sec)
mysql> CREATE DATABASE test_db;
Query OK, 1 row affected (0.01 sec)
mysql> show create database tese_db;
ERROR 1049 (42000): Unknown database ‘tese_db‘
mysql> show create database test_db;
+----------+------------------------------------------------------------------+
| Database | Create Database |
+----------+------------------------------------------------------------------+
| test_db | CREATE DATABASE test_db /!40100 DEFAULT CHARACTER SET utf8 / |
+----------+------------------------------------------------------------------+
1 row in set (0.00 sec)
删除数据库
mysql> DROP DATABASE test_db;
Query OK, 0 rows affected (0.09 sec)
数据库存储引擎
mysql> SHOW ENGINES\G
1. row
Engine: InnoDB
Support: DEFAULT
Comment: Supports transactions, row-level locking, and foreign keys
Transactions: YES
XA: YES
Savepoints: YES
2. row
Engine: MRG_MYISAM
Support: YES
Comment: Collection of identical MyISAM tables
Transactions: NO
XA: NO
Savepoints: NO
3. row
Engine: MEMORY
Support: YES
Comment: Hash based, stored in memory, useful for temporary tables
Transactions: NO
XA: NO
Savepoints: NO
4. row
Engine: BLACKHOLE
Support: YES
Comment: /dev/null storage engine (anything you write to it disappears)
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: CSV
Support: YES
Comment: CSV storage engine
Transactions: NO
XA: NO
Savepoints: NO
7. row
Engine: ARCHIVE
Support: YES
Comment: Archive storage engine
Transactions: NO
XA: NO
Savepoints: NO
8. row
Engine: PERFORMANCE_SCHEMA
Support: YES
Comment: Performance Schema
Transactions: NO
XA: NO
Savepoints: NO
9. row
Engine: FEDERATED
Support: NO
Comment: Federated MySQL storage engine
Transactions: NULL
XA: NULL
Savepoints: NULL
9 rows in set (0.00 sec)
查看默认存储引擎
mysql> show variables like ‘default_storage_engine‘;
+------------------------+--------+
| Variable_name | Value |
+------------------------+--------+
| default_storage_engine | InnoDB |
+------------------------+--------+
1 row in set (0.00 sec)

数据库的基本操作

标签：hive red nes isa value character null def error

原文地址：https://blog.51cto.com/14471717/2487264

踩

(0)

评论一句话评论（0）

分享档案

更多>

2021年07月29日 (22)
2021年07月28日 (40)
2021年07月27日 (32)
2021年07月26日 (79)
2021年07月23日 (29)
2021年07月22日 (30)
2021年07月21日 (42)
2021年07月20日 (16)
2021年07月19日 (90)
2021年07月16日 (35)

周排行