Re: parser that could handle "FROM... SELECT..." as well as "SELECT... FROM..."

Hi

út 8. 10. 2019 v 8:12 odesílatel Marius Andreiana <
marius(dot)andreiana(at)gmail(dot)com> napsal:

> Hello Postgres folks,
>
> After reading
> https://jvns.ca/blog/2019/10/03/sql-queries-don-t-start-with-select/
> and the discussions at https://news.ycombinator.com/item?id=21150606
> I'd also like to write "FROM... SELECT..." instead of "SELECT... FROM...".
>

This article is little bit strange, it mix syntax and execution together

>
> Postgres doesn't support this though. Would it be possible to please add
> parsing support for this syntax as well?
>

PostgreSQL supports ANSI/SQL. ANSI/SQL doesn't allow use clauses in any
order.

Personally I don't see any benefit of proposed feature - It breaks
portability of SQL queries (that is not high today).

Regards

Pavel

> Somebody mentioned:
> Engines don’t run sql directly. They make an AST, make an intermediate
> representation of instructions and then execute.
> So if it results in same AST, the parser should be flexible.
>

> Thanks!
> Marius
>