Mac下brew安装mysql
sudo mysql.server start报错
Starting MySQL
.Logging to '/usr/local/var/mysql/192.168.0.102.err'.
.. ERROR! The server quit without updating PID file (/usr/local/var/mysql/192.168.0.102.pid).
解决办法
sudo chown -R mysql /usr/local/var/mysql
通过以下命令来检查MySQL服务器是否启动
ps -ef | grep mysqld
mysql8.3.0 password -> authentication_string字段变化
管理mysql命令
以下列出了使用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 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
