mysql04-管理mysql常用指令

https://www.runoob.com/mysql/mysql-administration.html

1.常用指令

USE 数据库名 :
选择要操作的Mysql数据库，使用该命令后所有Mysql命令都只针对该数据库。
```
mysql> use RUNOOB;

Database changed
```

SHOW DATABASES:
列出 MySQL 数据库管理系统的数据库列表。

mysql> SHOW DATABASES;

+--------------------+

| Database           |

+--------------------+

| information_schema |

| RUNOOB             |

| cdcol              |

| mysql              |

| onethink           |

| performance_schema |

| phpmyadmin         |

| test               |

| wecenter           |

| wordpress          |

+--------------------+

10 rows in set (0.02 sec)

SHOW TABLES:
显示指定数据库的所有表，使用该命令前需要使用 use 命令来选择要操作的数据库。

mysql> use RUNOOB;

Database changed

mysql> SHOW TABLES;

+------------------+

| Tables_in_runoob |

+------------------+

| employee_tbl     |

| runoob_tbl       |

| tcount_tbl       |

+------------------+

3 rows in set (0.00 sec)

SHOW COLUMNS FROM 数据表:
显示数据表的属性，属性类型，主键信息，是否为 NULL，默认值等其他信息。

mysql> SHOW COLUMNS FROM runoob_tbl;

+-----------------+--------------+------+-----+---------+-------+

| Field           | Type         | Null | Key | Default | Extra |

+-----------------+--------------+------+-----+---------+-------+

| runoob_id       | int(11)      | NO   | PRI | NULL    |       |

| runoob_title    | varchar(255) | YES  |     | NULL    |       |

| runoob_author   | varchar(255) | YES  |     | NULL    |       |

| submission_date | date         | YES  |     | NULL    |       |

+-----------------+--------------+------+-----+---------+-------+

4 rows in set (0.01 sec)

SHOW INDEX FROM 数据表:
显示数据表的详细索引信息，包括PRIMARY KEY（主键）。

mysql> SHOW INDEX FROM runoob_tbl;

+------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+

| Table      | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |

+------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+

| runoob_tbl |          0 | PRIMARY  |            1 | runoob_id   | A         |           2 |     NULL | NULL   |      | BTREE      |         |               |

+------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+

1 row in set (0.00 sec)

SHOW TABLE STATUS [FROM db_name] [LIKE 'pattern'] \G:
该命令将输出Mysql数据库管理系统的性能及统计信息。

mysql> SHOW TABLE STATUS  FROM RUNOOB;   # 显示数据库 RUNOOB 中所有表的信息

mysql> SHOW TABLE STATUS from RUNOOB LIKE 'runoob%';     # 表名以runoob开头的表的信息

mysql> SHOW TABLE STATUS from RUNOOB LIKE 'runoob%'\G;   # 加上 \G，查询结果按列打印

巴特西

mysql04-管理mysql常用指令

https://www.runoob.com/mysql/mysql-administration.html

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