MS Sql Server not even mentioned. This tells us there is a whole world almost totally omitted from discussion on HN: "Enterprise"
Oracle isn't in there either, which goes to show how much of a bubble HN actually is considering MSSQL and Oracle are #1 and #2 in market share.
They are perhaps #1 and #2 in the "enterprise" market share, but in no way are they overall #1 and #2. Not even close. Which web app or startup uses them?