Look at database options, only the following are listed
MSSQL linux version should be available. as the linux flavor has been out since March 2016
instructions on how to install
http://www.tecmint.com/install-ms-sql-server-centos-ubuntu-linux/
docker image
https://hub.docker.com/r/microsoft/mssql-server-linux/
SQL Server on Linux Documentation
https://docs.microsoft.com/en-us/sql/linux/
It is already a lot of work to support MySQL (and soon to be added utf-8mb4 support), PostgreSQL, SQLite and Oracle. And the more databases are added, the less "custom" features can be used.
If MSSQL is to be added back again, it would be good if someone would volunteer to maintain this long term, someone who uses this on a productive system.
Unfortunately DB support cannot be added through apps as it ties in too closely within the system. One needs the DB to be setup to be able to enable apps. So it wouldn't be possible to let apps provide database functionality.
@hodyroff @DeepDiver1975 @pmaier1
Won't fix
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Won't fix