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

>> From: pgsql-novice-owner(at)postgresql(dot)org [mailto:pgsql-novice-owner(at)postgresql(dot)org] On Behalf Of Paul Linehan
>> Sent: Friday, August 29, 2014 9:44 AM
>> To: Chuck Roberts
>> Cc: pgsql-novice(at)postgresql(dot)org
>> Subject: [NOVICE] Join three tables and specify criteria... I know this should be easy!
>>
>>
>>
>> Now, I want the user who speaks English and the German - I may need to specify 3, 4
>> or conceivably even 5 languages.
>>
>> I have done this, but I'm stuck :-)
>> SELECT u.user_name, l.language_name
>> FROM user u
>> JOIN user_language ul
>> ON u.user_id = ul.ul_user_id
>> JOIN language l
>> ON ul.ul_iso_code = l.iso_code
>>

SELECT DISTINCT u.user_id
FROM user u
JOIN user_language ul
ON u.user_id = ul.ul_user_id
JOIN language l
ON ul.ul_iso_code = l.iso_code
WHERE u.user_language IN ('EN','DE')

(or)

WHERE "upper"(l.language_name) IN ('GERMAN','ENGLIGH')

See if this gives you what you want...

Ken Benson

>>
>> this gives me
>>
>> Sandor, German
>> Sandor, English
>> Gabor, English
>>
>> 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.
>> TIA and rgs,
>>
>> Paul...
>>
>>