This looks nice, and I look forward to taking the time to read through it more thoroughly, but one thing that jumped out to me from the navigation bar is the lo

This looks nice, and I look forward to taking the time to read through it more thoroughly, but one thing that jumped out to me from the navigation bar is the location of 'Window Functions' under 'Postgres Specific Tips'. Window functions are part of the SQL standard, and certainly not unique to Postgres. I don't have time to research the implementation history across major relational databases, but they've been available in MS SQL Server since 2008 at the latest, and I know they're present in Oracle as well. It would make sense to include these under 'General SQL'. Edit: Just noticed that this section is under both headings, nearly identically (some links are different). I didn't notice this before.