Re: union with count?

[Gerardo Herzig <gherzig(at)fmed(dot)uba(dot)ar>]

Thanks! But now i have another problem related with count():

select page_id, word, word_position, count(page_id) from (select * from 
search_word('word1', 'table1') union search_word('word2', 'table2')) foo 
group by page_id;

and gives me "foo.word must appear in GROUP clause or be used in an 
aggregate function"

And i want to group by page_id only, because that is what i need to 
count. Tips here?

Thanks again man.
Gerardo

> am  Wed, dem 28.03.2007, um 11:04:29 -0300 mailte Gerardo Herzig folgendes:
>  
>
> > Hi dudes, i have the following question
> > i have 2 tables with the same format, and i want to know if is there a 
> > possibility of using some sort of count(*) for achieving this result:
> > select a from table1 where (condition) union select a from table2 where 
> > (condition), count(a) group by a
> >
> > The idea is having how many times (condition) is true for both tables.
> >
> > Im not shure im explaining myself clearly, my english is not the best 
> > (as you can see ;)
> >    
>
> You can use a subselect, a simple example:
>
> test=# select *, count(1) from (select 1 union select 2 union select 3) foo group by 1;
> ?column? | count
> ----------+-------
>        1 |     1
>        2 |     1
>        3 |     1
> (3 rows)
>
>
> Andreas
>