Re: Order by lower(column-alias) doesn't work...

På torsdag 28. mai 2020 kl. 15:26:42, skrev Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us
<mailto:tgl(at)sss(dot)pgh(dot)pa(dot)us>>:
Andreas Joseph Krogh <andreas(at)visena(dot)com> writes:
> Is there a way to define "sorting-rules" on custom-types so that I can have
> ORDER BY <my_array_of_custom_types_alias> and PG will pick my custom
odering?

You'd have to write your own type, which would be a lotta work :-(.

A possible partial answer is to define the composite type as

firstname citext, lastname citext, other-fields-here

and then the regular composite-type comparison rule would give you
approximately what you said you wanted ... but only approximately.

regards, tom lane

Hm, ok. I think the most non-intrusive way for me is to craft a sub-select
producing the "varchar-string-flattened" so I can order by that alias.

--
Andreas Joseph Krogh