As the others have mentioned, you'll be safe picking any of the four big relational databases (Oracle, MySQL, MS SQL, PostgreSQL). It's worth noting that, if you've really picked the wrong one, it's relatively easy to switch. With NoSQL, this is a bit harder as even with similar database models, there's often no shared query language.
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As the others have mentioned, you'll be safe picking any of the four big relational databases (Oracle, MySQL, MS SQL, PostgreSQL). It's worth noting that, if you've really picked the wrong one, it's relatively easy to switch. With NoSQL, this is a bit harder as even with similar database models, there's often no shared query language.