Re: [SQL] problem with join & count

> i need an sql query that will return:
>
> name | how_often
> -------------------
> toto | 2
> titi | 1
> tutu | 2
>
> that is, the result table should contain all names present in the first table
> and then the number of times the number associated with the name appears in
> the second table.

Postgres does not (and v6.5 will not) support outer joins or
subselects in the targetlist, what's required to do that in a
single SQL statement.

What you could do is using a SQL function that covers the
count() like this:

create function num_refs (int4) returns int4 as '
select count(*) from tab2 where id = $1;
' language 'SQL';

select item_name, num_refs(id) as how_often from tab1;

I changed 'number' into id and name into item_name because
both are reserved words.

Jan

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