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Date: Fri, 31 Oct 2003 18:14:56 +0000
From: "mlunnon @ RWA" <mlunnon@rwa-net.co.uk>
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To: pgsql-sql@postgresql.org
Subject: Re: conditional query?
References: <Pine.LNX.4.44.0310311544270.13725-100000@matrix.gatewaynet.com>
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Try something like<br>
<br>
SELECT p2.* <br>
FROM profile p1, profile p2 <br>
WHERE ( p1.id =1 AND useParenAddres = 'N' AND p2.id = p1.id ) <br>
OR ( p1.id =1 AND useParenAddres = 'Y' AND p2.id = p1.parentId) <br>
<br>
Obviously this won't work if you have more than one level of parent
hood, i.e. it would pick up a grand parent.&nbsp; If this is the case then
there is some kind of tree walking functionality in Postgres but I
don't know how portable this is or whether it will solve your problem.<br>
<br>
Another way to solve the grand parent thing would be to define a
recursive function.<br>
<br>
Happy coding.<br>
<br>
Cheers<br>
Matthew<br>
<br>
<br>
Achilleus Mantzios wrote:<br>
<blockquote type="cite"
 cite="midPine.LNX.4.44.0310311544270.13725-100000@matrix.gatewaynet.com">
  <pre wrap="">Why dont you try a combination of
CASE WHEN ... THEN ... ELSE ... END construct
along with a LEFT OUTER join (in case parentId is null).

Not sure how "portable" the above will be.

O kyrios Frank Morton egrapse stis Oct 31, 2003 :

  </pre>
  <blockquote type="cite">
    <pre wrap="">I have a table called a "profile" that has company addresses as well
as individual contact information. Simpifying:

id (the primary key)
parentId (any profile can have a parent ie, contact parent is a company)
address (for this example, will just have one piece of the address)
useParentAddress

If "useParentAddress"=="Y", that means that the parent address of this
person should really be used for mailings. If == "N" then the address
with that profile is the right one to use.

Is there any way to do a single select to get a single "address" back
that is the right one depending on the value of "useParentAddress"
field?

Also want to make this sql as portable as possible.

Will appreciate any ideas.


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