On 7/1/20 10:34 PM, Pavel Stehule wrote: > st 1. 7. 2020 v 22:31 odesílatel Vik Fearing <vik@postgresfriends.org> > napsal: > >> On 7/1/20 9:32 PM, Pavel Stehule wrote: >>> st 1. 7. 2020 v 20:19 odesílatel Vik Fearing <vik@postgresfriends.org> >>> napsal: >>> >>>> On 7/1/20 3:36 PM, Robert Haas wrote: >>>>> I actually don't have a very clear idea of what the standard has to >>>>> say about SQL-language functions. Does it just say it's a list of >>>>> statements, or does it involve variables and control-flow constructs >>>>> and stuff like that, too? >>>> >>>> >>>> It's either a single sql statement, or a collection of them between >>>> "begin atomic" and "end". There are no variables or flow control >>>> constructs or anything like that, just as there are no such things >>>> outside of a function. >>>> >>> >>> What is the source of this comment? >> >> >> The SQL Standard. >> > > The SQL Standard is really big, and is very possible so I miss this part. > Can you send me a link?
I am looking there, and it looks like a subset of SQL/PSM or better - SQL/PSM is extending this. But this part is a little bit strange, because it doesn't introduce its own variables, but it is working with the concept of host variables and is a little bit messy (for me). Looks like it is introduced for usage in triggers. If we support triggers without trigger functions, then it has sense. Without it - It is hard for me to imagine a use case for this reduced language.