Oracle has the largest market share and it runs on multi-platforms.
MS SQL is limited to MS Windows even though there’s some movement to make it run on non-MS Windows platform.
It’s also easier to learn than Oracle.
MS Access doesn’t seem to be a marketable skill, even though most of small databases are in Access at most companies.
What do you think is the best database software to get a job in database industry? I have field experience only with Access and Membership Plus.