I first started working with databases when I used Access as my database for Address Keeper, a little VB app I had on Nonags for awhile. Just something for me to learn on and enhance my skills.
Then I took my first internship right out of high school, back in 1998. That's where I learned what UNIX was and how it had its own databases (but I don't remember which they used then). They had me using a UNIX workstation but I spent more time in the Windows lab, working on projects with a consultant, learning about this thing called SQL Server. I also got a little bit of time in with the Oracle DBA, but what little time I did get in scared me.
The next internship took me into the database functionality with FoxPro
My third internship brought me back to the MS arena - helping a company move their apps from Access to MS SQL Server.
In my capstone project, I had the joys of revisiting Oracle.
I took a break from working at companies with Windows based servers. That's when I took on my own personal projects and learned a bit with mySQL and postgres.
Now, I'm back in a SQL Server environment, and I'm glad I'm back in such an easy environment to work with. I'm a programmer by nature, but I get our DBA responsibilities as well, so I'm learning some new things as I go. (Though at home, I'm a mySQL kind of gal )