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1、下載mysql5.7.25安裝包
默認是最新版本，點擊查看以前的版本，選擇5.7.25版本的dmg文件進行下載。
事實證明最新版安裝時候會有很多問題！所以儘量選擇比較穩定的版本。
2、點擊dmg文件安裝
注意記住最後一步的隨機密碼（或者截圖）！以後改密碼要用！
mac系統會有通知
3、更改mysql默認密碼
檢查mysql服務是否啓動，默認安裝後自動啓動。在系統偏好設置->點擊mysql服務->啓動服務
進入mysql bin目錄下
默認地址：
cd /usr/local/mysql-5.7.25xxx/bin
修改密碼：
mysql -u root -p password newpass
新密碼登錄：
mysql -u root -p
4、連接本地 Sequel pro
如果standard方式無法連接就試一下3307端口號；
獲者Socket方式連接。
5、MySQL server PID file could not be found!
類似於mysql server PID的報錯：
參考文章：https://blog.csdn.net/u010098331/article/details/50752667/
6、mysql服務無法開啓(自定義mysql配置文件)
因爲mysql5.7.25沒有在本地生成配置文件，我在/etc/建立my.cnf文件時數據木留設置錯誤，把這個文件刪除即可
爲了解決接下來的問題，最好在/etc/新建my.cnf配置文件，mysql會優先讀取（需要先修改文件權限）
my.cnf
# Example MySQL config file for small systems.
#
# This is for a system with little memory (<= 64M) where MySQL is only used
# from time to time and it's important that the mysqld daemon
# doesn't use much resources.
#
# MySQL programs look for option files in a set of
# locations which depend on the deployment platform.
# You can copy this option file to one of those
# locations. For information about these locations, see:
# http://dev.mysql.com/doc/mysql/en/option-files.html
#
# In this file, you can use all long options that a program supports.
# If you want to know which options a program supports, run the program
# with the "--help" option.
# The following options will be passed to all MySQL clients
[client]
default-character-set=utf8
#password = your_password
port = 3306
socket = /tmp/mysql.sock
# Here follows entries for some specific programs
# The MySQL server
[mysqld]
default-storage-engine=INNODB
character-set-server=utf8
collation-server=utf8_general_ci
port = 3306
socket = /tmp/mysql.sock
skip-external-locking
key_buffer_size = 16K
max_allowed_packet = 1M
table_open_cache = 4
sort_buffer_size = 64K
read_buffer_size = 256K
read_rnd_buffer_size = 256K
net_buffer_length = 2K
thread_stack = 512K
# Don't listen on a TCP/IP port at all. This can be a security enhancement,
# if all processes that need to connect to mysqld run on the same host.
# All interaction with mysqld must be made via Unix sockets or named pipes.
# Note that using this option without enabling named pipes on Windows
# (using the "enable-named-pipe" option) will render mysqld useless!
#
#skip-networking
server-id = 1
# Uncomment the following if you want to log updates
log-bin=mysql-bin
# binary logging format - mixed recommended
#binlog_format=mixed
# Causes updates to non-transactional engines using statement format to be
# written directly to binary log. Before using this option make sure that
# there are no dependencies between transactional and non-transactional
# tables such as in the statement INSERT INTO t_myisam SELECT * FROM
# t_innodb; otherwise, slaves may diverge from the master.
#binlog_direct_non_transactional_updates=TRUE
# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = /usr/local/mysql/data
#innodb_data_file_path = ibdata1:10M:autoextend
#innodb_log_group_home_dir = /usr/local/mysql/data
# You can set .._buffer_pool_size up to 50 - 80 %
# of RAM but beware of setting memory usage too high
#innodb_buffer_pool_size = 16M
#innodb_additional_mem_pool_size = 2M
# Set .._log_file_size to 25 % of buffer pool size
#innodb_log_file_size = 5M
#innodb_log_buffer_size = 8M
#innodb_flush_log_at_trx_commit = 1
#innodb_lock_wait_timeout = 50
[mysqldump]
quick
max_allowed_packet = 16M
[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates
[myisamchk]
key_buffer_size = 8M
sort_buffer_size = 8M
[mysqlhotcopy]
interactive-timeout
[mysqld]
transaction-isolation=READ-COMMITTED
sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
7、MySQL無法重啓報錯Warning: World-writable config file ‘/etc/my.cnf’ is ignored的解決方法
修改文件權限，不能是777，mysql會啓動保護措施忽略此文件
chmod 644 /etc/my.cnf
8、mac命令行下啓動、重啓、關閉mysql服務
#啓動MySQL服務
sudo /usr/local/MySQL/support-files/mysql.server start
#停止MySQL服務
sudo /usr/local/mysql/support-files/mysql.server stop
#重啓MySQL服務
sudo /usr/local/mysql/support-files/mysql.server restart
9、mysql5.7.25與mysql5.6.XX版本問題
mysql命令gruop by報錯this is incompatible with sql_mode=only_full_group_by
查看sql_model參數命令：
SELECT @@GLOBAL.sql_mode;
SELECT @@SESSION.sql_mode;
發現：
ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
第一項默認開啓ONLY_FULL_GROUP_BY
在/etc/my.cnf下添加：
sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
重啓服務生效！
10、mac下徹底卸載mysql(上述辦法都無法解決問題時！)
打開終端窗口
使用mysqldump備份你的數據庫將文本文件!
停止數據庫服務器
sudo rm /usr/local/mysql
sudo rm -rf /usr/local/mysql*
sudo rm -rf /Library/StartupItems/MySQLCOM
sudo rm -rf /Library/PreferencePanes/My*
edit /etc/hostconfig and remove the line MYSQLCOM=-YES-
rm -rf ~/Library/PreferencePanes/My*
sudo rm -rf /Library/Receipts/mysql*
sudo rm -rf /Library/Receipts/MySQL*
sudo rm -rf /private/var/db/receipts/*mysql*