Re: Usage of function retruning record in query

2011/7/5 gmb <gmbouwer(at)gmail(dot)com>:
>
> gmb wrote:
>>
>>
>> Thanks for the feedback, Harald.
>>
>> How about specifying different aliases to the resulting values?
>> This will be handy when I use the same function multiple times in the same
>> query.
>> (the function will take another input parameters used in the calculations)
>>
>> E.g.:
>> SELECT itemid, (calcvalues(itemid, '2011-06-06')).*, (calcvalues(itemid,
>> '2011-06-07')).* FROM itemlist;
>>
>>  itemid | calcval1 | calcval2 | calcval1 | calcval2
>> --------+----------+----------+----------+----------
>>       4 | 0.67     | 10.00    | 0.64     | 65.23
>>       5 | 1.55     | 45.00    | 1.23     | 23.25
>>       6 | 3.60     | 69.00    | 2.98     | 62.66
>> How will I manage unique column names for this output?
>>
> Hmm.. no takers? I guess not possible then?
> Thanks anyway
>

hello

try to wrap your query to subselect,

npcps_201=# select 1,2,2,3;
?column? │ ?column? │ ?column? │ ?column?
──────────┼──────────┼──────────┼──────────
1 │ 2 │ 2 │ 3
(1 row)

Time: 0.171 ms
npcps_201=# select * from (select 1,2,2,3) x (a,b,c,d);
a │ b │ c │ d
───┼───┼───┼───
1 │ 2 │ 2 │ 3
(1 row)

Time: 0.202 ms

Regards

Pavel Stehule

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