Why don't DBMS's support ASSERTION

Question

So I recently learned about ASSERTION in my databases course, and my prof noted that major databases don\'t support it, even though it is in the SQL-92 standard. I tried go

Answer 1

Oracle is considering this as possible enhancement for the next version after 12c Release 2, see this post from May 2016 by Toon Koppelaars.

If you are interested in the feature, I suggest upvoting it.