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常见管理MySQL的命令
使用Mysql数据库过程中常用的命令:
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 School;
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 | |
| 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 School;
Database changed
mysql> SHOW TABLES;
+------------------+
| Tables_in_School |
+------------------+
| employee_tbl |
| student_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 student_tbl;
+-----------------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------------+--------------+------+-----+---------+-------+
| student_id | int(11) | NO | PRI | NULL | |
| student_title | varchar(255) | YES | | NULL | |
|+-----------------+--------------+------+-----+---------+-------+
2 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 case_tbl;
+------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| case_tbl | 0 | PRIMARY | 1 | case_id | A | 2 | NULL | NULL | | BTREE | | |
+------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
1 row in set (0.00 sec)
SHOW TABLE STATUS LIKE [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 SCHOOL; # 显示数据库 SCHOOL 中所有表的信息
mysql> SHOW TABLE STATUS from SCHOOL LIKE 'student%'; # 表名以student开头的表的信息
mysql> SHOW TABLE STATUS from SCHOOL LIKE 'student%'\G; # 加上 \G,查询结果按列打印