Re: AW: SQL99 functions

Zeugswetter Andreas SB <ZeugswetterA(at)wien(dot)spardat(dot)at> writes:
>> Thomas Lockhart <lockhart(at)alumni(dot)caltech(dot)edu> writes:
>>>> create table t1 (x int);
>>>> create function foo (out int) returns int as ...;
>>>> select foo(x) from t1;
>>
>>>> will give two columns for the result.
>>
>> You've *got* to be kidding.
>>
>> To name just one problem with that, where do I put an AS to relabel
>> the extra column?

> It gets the name of the variable ( here "out"), no way to rename it,
> but no problem since you can name the variable however you like.

What? OUT is a keyword there; I don't see any explicit name for the
function's formal parameter at all.

BTW, what happens when I use foo() in a place other than the top level
of a SELECT list?

Examples:

SELECT (CASE WHEN x > 0 THEN foo(x) ELSE 42 END) FROM table

SELECT x FROM table WHERE foo(x) > 0

Also, I still haven't figured out what INOUT is supposed to do.

There are some things that are too brain-dead to consider implementing,
whether they are in SQL99 or not, and this is sounding a lot like
one of them...

regards, tom lane