Long time HN lurker...I've worked with kdb+ / k the last few years, it's in every major bank and is great for storing and querying market data. If you're looking for a nice GUI I use qStudio, it helps make it a little more friendly.
Then there are great tutorials on the code k website. It's a beautiful language full of unique original ideas.
Then there are great tutorials on the code k website. It's a beautiful language full of unique original ideas.