$ brew info mariadb
mariadb: stable 10.2.12 (bottled), devel 10.3.4
Drop-in replacement for MySQL
https://mariadb.org/
Conflicts with:
  mariadb-connector-c (because both install plugins)
  mysql (because mariadb, mysql, and percona install the same binaries.)
  mysql-cluster (because mariadb, mysql, and percona install the same binaries.)
  mysql-connector-c (because both install MySQL client libraries)
  mytop (because both install `mytop` binaries)
  percona-server (because mariadb, mysql, and percona install the same binaries.)
/usr/local/Cellar/mariadb/10.2.12 (640 files, 170MB) *
  Poured from bottle on 2018-01-27 at 00:05:02
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/mariadb.rb
==> Dependencies
Build: cmake ✘
Required: openssl ✔
==> Options
--with-archive-storage-engine
	Compile with the ARCHIVE storage engine enabled
--with-bench
	Keep benchmark app when installing
--with-blackhole-storage-engine
	Compile with the BLACKHOLE storage engine enabled
--with-embedded
	Build the embedded server
--with-libedit
	Compile with editline wrapper instead of readline
--with-local-infile
	Build with local infile loading support
--with-test
	Keep test when installing
--devel
	Install development version 10.3.4
==> Caveats
A "/etc/my.cnf" from another install may interfere with a Homebrew-built
server starting up correctly.

MySQL is configured to only allow connections from localhost by default

To connect:
    mysql -uroot

To have launchd start mariadb now and restart at login:
  brew services start mariadb
Or, if you don't want/need a background service you can just run:
  mysql.server start

$