"David G. Johnston" <david.g.johnston@xxxxxxxxx> writes: > I agree the material in Extending SQL - SQL Functions, plus normal > expectations, mean that we do indeed cover the topic sufficiently. The > location and specifics of the material and use of cross-references could > use some attention though its also not an area that gets too many questions > so people are figuring this all out one way or another (or not finding a > need and just don’t know what they are missing…) Yeah, there is a lot of material in that chapter that is about using functions, not just writing them. I don't think anyone's entirely happy about the current factorization of those parts of the manual; but it's not entirely clear how to make it better, either. regards, tom lane