Re: select few fields as a single field

Ok I think after all I will use view.
However i'll have to join many tables in the view want it slow the performance dramatically ?
I run explain on the view and got
explain select event_id from get_event;
NOTICE:  QUERY PLAN:
Merge Join  (cost=376812.28..389383.78 rows=10000000 width=60)
when the biggest table contains 40 records only

when explain select event_id from intelligence;  :
NOTICE:  QUERY PLAN:
Seq Scan on intelligence  (cost=0.00..20.00 rows=1000 width=4)
 

Holger Krug wrote:

On Thu, Jan 10, 2002 at 12:58:18PM +0200, Roman Gavrilov wrote:
> Thank you for your response.
> Yes I know that i can make a function.
> Is there a way to do this transparently I want to treat this function as a
> field in the table.

No.

> The reason why i want to do that is because i have a class that has generic
> method to retrieve data.
> It receives list of field names and returns their values from the table.
> If I want to implement the function method i will have to modify the class
> method and will have to treat specially the
> retrieve fullname thing.

OK. But why not views ? That's exactly the use case where views should
be used in PostgreSQL. Using views you need not modify anything in
your class.

Alternative solution:

Change your class (if possible) to have the members name, version,
release and add a method getFullName() to the class. (I would never
do this but use views.)

--
Holger Krug
hkrug@rationalizer.com

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