I don't know of any such, and my experience is that it doesn't currently exist. Most are side by side comparisons of two databases. That information requires experts in all the databases encountered, which isn't common. Versions depend too, to know what is supported.
ANSI functions are making strides to ensure syntax is supported across databases, but it's dependent on vendors implementing the spec. And to date, they aren't implementing the entire ANSI spec at a time.
But you can crowd source on sites like this one by asking specific questions and including the databases involved and the versions used.