Re: Join three tables and specify criteria... I know this should be easy!

Kevin Grittner-5 wrote
> Paul Linehan <

> linehanp@

> > wrote:
>> I really want Sandor's id - that's all that really counts.
>
>>
>> Give me the ids of all who speak 'EN' and 'DE' (or
>> possibly 'EN', 'DE', 'NL' and 'FR') for example.
>
> WITH required_languages(iso_code) AS (VALUES ('EN'),('DE'))
> SELECT u.user_id, u.user_name
>   FROM (
>           SELECT ul.ul_user_id, count(*) cnt
>             FROM required_languages r
>             JOIN user_language ul on (ul.ul_iso_code = r.iso_code)
>             GROUP BY ul.ul_user_id
>             HAVING count(*) >= (SELECT count(*) FROM required_languages
> r2)
>        ) x
>   JOIN "user" u ON (u.user_id = x.ul_user_id);

The following is also generally useful:

iso_code = ALL(regexp_split_to_array(?::text,';'))

Where you can then pass in a string like:

'DE;EN'

Via your client library parameterized query capability (or psql variable)

David J.




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