Did you know that MySQL has stated principles for its products as well as for its employees. It's a bit more substantial than your average mission statement blah ;-)
Every person who once signed up to be an employee of the original MySQL AB essentially also signed for upholding these principles, but perhaps you haven't seen them. Since it is public info, why not take a peek!

To me personally, both lists have always felt mainly like a written down description of how Monty (MySQL's original author and co-founder of MySQL AB) likes to work (and I do see that as a positive thing). The product ones get quoted often enough, but not the employee ones, so here's they are:
We want the people working on MySQL to:

• Subscribe to the Open Source philosophy
• Aim to be good citizens
• Prefer partners that share our values and mindset …