MySQL5.7のインストール

これがめちゃくちゃ参考になった。
https://weblabo.oscasierra.net/mysql-57-homebrew-install/

asatokensei@MacBook-Air memopy % brew install mysql@5.7
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/core).
==> Updated Formulae
benthos        broot          clojure        exploitdb      freetds        inxi           jc             mutt           phpstan        terragrunt     wtf            yq

==> Downloading https://homebrew.bintray.com/bottles/mysql%405.7-5.7.29.catalina.bottle.tar.gz
==> Downloading from https://akamai.bintray.com/bf/bf0cdc294df996455c8abad3e03b6691f2145a4036085ad2570ec6c993e6b9c0?__gda__=exp=1592203912~hmac=7b0c7f804ecbf5c35cb08f36b76cf74de21f31f
######################################################################## 100.0%
==> Pouring [e-mail]
==> Caveats
We've installed your MySQL database without a root password. To secure it run:
    mysql_secure_installation

MySQL is configured to only allow connections from localhost by default

To connect run:
    mysql -uroot

mysql@5.7 is keg-only, which means it was not symlinked into /usr/local,
because this is an alternate version of another formula.

If you need to have mysql@5.7 first in your PATH run:
  echo 'export PATH="/usr/local/opt/mysql@5.7/bin:$PATH"' >> ~/.zshrc

For compilers to find mysql@5.7 you may need to set:
  export LDFLAGS="-L/usr/local/opt/mysql@5.7/lib"
  export CPPFLAGS="-I/usr/local/opt/mysql@5.7/include"

For pkg-config to find mysql@5.7 you may need to set:
  export PKG_CONFIG_PATH="/usr/local/opt/mysql@5.7/lib/pkgconfig"


To have launchd start mysql@5.7 now and restart at login:
  brew services start mysql@5.7
Or, if you don't want/need a background service you can just run:
  /usr/local/opt/mysql@5.7/bin/mysql.server start
==> Summary
🍺  /usr/local/Cellar/mysql@5.7/5.7.29: 319 files, 232.3MB

パスを見てみる。↓

asatokensei@MacBook-Air memopy % which mysql           
/usr/local/opt/mysql@5.7/bin/mysql

パスが合ってなかったらパスを通す。
今回は合ってたのでスルー。
詳しくはこの記事↓
https://weblabo.oscasierra.net/mysql-57-homebrew-install/

バージョン見ると、、、

asatokensei@MacBook-Air memopy % mysql --version
mysql  Ver 14.14 Distrib 5.7.29, for osx10.15 (x86_64) using  EditLine wrapper

ちゃんとできてる！

以下のエラーが出る人へ

asatokensei@MacBook-Air memopy % mysql.server start
Starting MySQL
. ERROR! The server quit without updating PID file (/usr/local/var/mysql/MacBook-Air.pid).

この記事を↓
https://qiita.com/kenkeeeenbbt/items/bf7045c5ca433a4ac342