Luckily pretty much nobody needs the standard documents. It's actually my aim at https://modern-sql.com/ to make the relevant information more accessible — in particular including support-matrices ("Can I Use").
Not all specs are particularly accessible (e.g. ECMAScript is often hard to follow if you haven’t spent a fair bit of time around it—it’s mostly natural-language code that works with a ECMAScript virtual machine), but most of the time, I would much rather have the actual spec over someone’s digested summary that covers what they thought was important, but regularly lacks details important for my situation. Some specs are absolutely magnificent. The HTML Standard is my very favourite as both a piece of spec work and as reference material.
Seriously, specs are really good stuff and it makes me sad how people often ignore them because they assume they’ll be inscrutable. (Similar remarks apply to legislative texts. They’re normally pretty easy to understand, and you find all kinds of sometimes fun and sometimes useful gems that potted summaries exclude.)
Having that said: free would be better.
So unless you are writing a database yourself, the DMBS documentation is going to be more relevant.
My only issue is with the width. While whitespace between the sides and the centre content is very useful, this isn’t the 1990s anymore with its 1024×768 monitors. You _can_ make the centre column responsive to the overall width of the screen. Doing so can also give you a lot more room to do things, and make it easier to read. Your line-height is already great, and is perfect for text blocks a good half again wider if not twice as wide. Even on my vertical monitors, which are only 1500px wide, that centre column is pretty much claustrophobically narrow.
But thanks for the feedback. There is a rework pending anyway.
How we could we add Snowflake to the compatibility matrices?
It's popular enough to deserve it, IMHO.