Selecting rows as if they were columns?

From: Kurt Overberg <kurt(at)hotdogrecords(dot)com>
To: pgsql-sql(at)postgresql(dot)org
Subject: Selecting rows as if they were columns?
Date: 2003-10-09 13:14:32
Message-ID: 3F855F38.9070803@hotdogrecords.com
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Gang,

I've got what I think should be a pretty simple problem- I just can't
figure out how I'd do it. Heck, I can't even figure out how I'd search
for an answer to this problem.

I've got 2 tables: member and member_attr

Member is just a standard entry for a member. Very simple:

table member {
id integer,
name character varying(30)
}

Member_attr is just a table of name/value pairs, such as:

table memberextra {
memberid integer,
param1 character varying(512),
param2 character varying(512),
}

where param1 is the name, param2 is the value.

Right now, I can:

select member.id, member.name, member_attr.param1, member_attr.param2
from member, member_attr where member.id = member_attr.memberid;

...this gives me n rows per member where n = # of attributes for that
member, like this:

id | name | param1 | param2
=======================================
1 | dave | home | /home/dave
1 | dave | testing | 1
2 | john | home | /home/john

...is there some way to make this return like this:

id | name | home | testing
======================================
1 | dave | /home/dave | 1
2 | john | /home/john |

...where it sort of "expands" the rows out into columns? Am I just
going about this the wrong way? Thoughts on the subject would be
greatly appreciated.

thanks!

/kurt

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