Tough thing with dealing with SQL queries is they vary slightly from DB to DB. We had quite a few different research projects going on at my last job where I'd have to deal with mySQL, PostgreSQL, MS SQL, and Oracle. Talk about a pain in the butt getting all the query syntax mixed up when I hadn't used a particular system in a while!
In the end, I think I liked mySQL a bit better than the rest; while they all have their pro's and con's, mySQL had the best value... being free (so is PostgreSQL, but mySQL was more widely used and had a nice freeware GUI for Windows you could use mySQLPal)!
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