Re: Largest & Smallest Functions

čt 8. 11. 2018 v 7:02 odesílatel Ken Tanzer <ken(dot)tanzer(at)gmail(dot)com> napsal:

>
>
> On Wed, Nov 7, 2018 at 9:48 PM Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
> wrote:
>
>>
>> You can pass variadic arguments as a array
>>
>> postgres=# \sf smallest
>> CREATE OR REPLACE FUNCTION public.smallest(VARIADIC anyarray)
>> RETURNS anyelement
>> LANGUAGE sql
>> IMMUTABLE
>> AS $function$
>> SELECT min($1[i]) FROM generate_subscripts($1, 1) g(i);
>> $function$
>>
>> postgres=# select smallest(VARIADIC ARRAY[1,2,3]);
>> ┌──────────┐
>> │ smallest │
>> ╞══════════╡
>> │ 1 │
>> └──────────┘
>> (1 row)
>>
>>
> That's very helpful and good to know. It's too bad that doesn't work with
> LEAST/GREATEST, which would eliminate the need for extra functions.
>

These functions are differently implemented - and they are older than
support of variadic functions.But implementation of passing a array should
be easy.

Pavel

> Thanks!
>
> Ken
>
>
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