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.
Nor is DB2. A non trivial amount of HN's personal wealth is being tracked with this technology right now.
I'll admit I don't even know what DB2 is