Lluís,

First, what version of Views are you using?

If Views 1 (Drupal 5): what you need then is for your custom module to implement hook_views_tables().  That is how you tell the views module about your data and define fields and filters that are available to it.  start here: http://drupal.org/node/99564 and read through to part 5: Filters.

If Views 2 (Drupal 6): you need to use hook_views_data() which you can read more about here: http://views-help.doc.logrus.com/help/views/api-tables.  from that documentation page, in the Describing Fields On Tables section: "... each table can also have an unlimited number of field designations; these correspond roughly to fields on the table, though it is very common to use non-fields to display data that isn't directly in a field, such as data arrived from formulae..."
be sure to have a look at http://views-help.doc.logrus.com/help/views/api as well for info on using hook_views_api() and where the other views hooks should be placed.

Seth

Lluís wrote: 
On Tue, Aug 25, 2009 at 2:55 PM, Jocimar Lopes<gavranha@rankcine.com> wrote:
  
Hi, Lluís

have you tried computed_field module? If a understood you question, it may
solve that.
    

If I am right computed_field is useful when using cck, but I am using
a custom module with custom content types.
I am trying to write a module to allow SQL operations using hidden
fields inside the query. I thing it is the best option because there
is no redundant data.

My final query should look like: SELECT (a+b) AS any_alias, C FROM
table GROUP BY C
I have had a look at views_calc but it cannot work with grouped queries.

  
[]s

Lluís wrote:
    
I have a view with two fields (A and B), both of them numeric. I want
to make a filter to show nodes when A + B = 0

How can I make this? I suppose I should add A and B as hidden fields
and then there should be a calculated field anywhere allowing to
add(), concatenate(), .... But I have been unable to find this module.

Thanks


      
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