multiple lookup per row
От | Gary Stainburn |
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Тема | multiple lookup per row |
Дата | |
Msg-id | 01072010391603.16118@gary.ringways.co.uk обсуждение исходный текст |
Ответы |
Re: multiple lookup per row
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Список | pgsql-sql |
Hi all, I've got a table 'phones' which has an indexed key 'pid' of type int4, and a phone number of type varchar(12). I've then got a table 'members' which as an index key 'mid' of type int4. Now, obviously, if each member only had one phone number, I could simply pull it in using a join. My problem is that each member has (potentially) a voice line 'mphone', a fax line 'mfax', and a mobile (that's a cellphone to you lot over the pond) 'mmobile'. How would I embelish a 'select * from members........' so that it included the three phone numbers if they exist? The only solution I can think of is to write a plpgsql function to do the lookup and call that three times as part of the select, something like select *, getphone(mphone) as phone, getphone(mfax) as fax..... but a purely SQL solution would be nicer. -- Gary Stainburn This email does not contain private or confidential material as it may be snooped on by interested government parties for unknown and undisclosed purposes - Regulation of Investigatory Powers Act, 2000
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