Thread: Help with a view
I've created a view 'principals' that gives me this output: pgslekt=> select * from principals where event=15821;person | event | place | sort_date | tag_type --------+-------+-------+------------+---------- 2 | 15821 | 1152 | 1999-09-17 | 4 3 | 15821 | 1152 | 1999-09-17| 4 (2 rows) How do I go about selecting the "other" person of this event, given that I have one of them and the event number? I'd also like a view that gives me the two rows combined into one, with "person" replaced by p1 and p2. -- Leif Biberg Kristensen http://solumslekt.org/
SELECT * FROM principals WHERE event = 15821 AND person != 2? Dmitri > -----Original Message----- > From: pgsql-sql-owner@postgresql.org > [mailto:pgsql-sql-owner@postgresql.org] On Behalf Of Leif B. > Kristensen > Sent: Thursday, September 22, 2005 1:30 PM > To: pgsql-sql@postgresql.org > Subject: [SQL] Help with a view > > > I've created a view 'principals' that gives me this output: > > pgslekt=> select * from principals where event=15821; > person | event | place | sort_date | tag_type > --------+-------+-------+------------+---------- > 2 | 15821 | 1152 | 1999-09-17 | 4 > 3 | 15821 | 1152 | 1999-09-17 | 4 > (2 rows) > > How do I go about selecting the "other" person of this event, > given that > I have one of them and the event number? > > I'd also like a view that gives me the two rows combined into > one, with > "person" replaced by p1 and p2. > -- > Leif Biberg Kristensen > http://solumslekt.org/ > > ---------------------------(end of > broadcast)--------------------------- > TIP 4: Have you searched our list archives? > http://archives.postgresql.org The information transmitted is intended only for the person or entity to which it is addressed and may contain confidentialand/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any actionin reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you receivedthis in error, please contact the sender and delete the material from any computer
On Thursday 22 September 2005 20:03, Dmitri Bichko wrote:
> SELECT * FROM principals WHERE event = 15821 AND person != 2?
Sure, that's a concise answer to what I actually wrote, but it wasn't
exactly what I intended :)
Basically, what I've got is the first person and the tag_type. I can do
it with a function from PHP:
function get_spouses($p) { $handle = pg_query("select person from principals where event in
(selectevent from principals where person = $p and tag_type = " .MARR. ")
orderby sort_date"); $i=0; $spouses = array(); while ($row = pg_fetch_row($handle) { if $row[0] != $p
$spouses[$i++] = $row[0]; } return $spouses;
}
But this is *ugly* ...
--
Leif Biberg Kristensen
http://solumslekt.org/
> Basically, what I've got is the first person and the tag_type. I can do
> it with a function from PHP:
>
> function get_spouses($p) {
> $handle = pg_query("select person from principals
> where event in (select event from principals
> where person = $p and tag_type = " .MARR. ")
> order by sort_date");
What about adding an extra condition ' and person <> $p ?
select person from principals as a where event in (select event from
principalsas b where person = $p and tag_type = " .MARR. ") and a.person
<>$p order by sort_date
>pgslekt=> select * from principals where event=15821;
>person | event | place | sort_date | tag_type
>--------+-------+-------+------------+----------
> 2 | 15821 | 1152 | 1999-09-17 | 4
> 3 | 15821 | 1152 | 1999-09-17 | 4
(2 rows)
>I'd also like a view that gives me the two rows combined into one, with
>"person" replaced by p1 and p2.
might consider grouping by all other columns except person and use an
aggregate function over person ,
CREATE VIEW blah AS select list(person) as persons , event , place ,
sort_date , tag_type from principals group by event , place ,
sort_date , tag_type ;
(list is a custom function in my database , currently not posted)
not sure though if i got your problem exactly.
regds
mallah.
> $i=0;
> $spouses = array();
> while ($row = pg_fetch_row($handle) {
> if $row[0] != $p
> $spouses[$i++] = $row[0];
> }
> return $spouses;
> }
I don't understand how this is different:
SELECT person FROM principals
WHERE event IN (SELECT event FROM principals WHERE person = $p AND
tag_type = " .MARR. ")
AND person != $p
ORDER BY sort_date
Or without subselects:
SELECT p1.person
FROM principals p1
JOIN principals p2 USING(event)
WHERE p2 person = $pAND p2.tag_type = " .MARR. "AND p1.person != $p
ORDER BY sort_date
Am I being confused?
Dmitri
> -----Original Message-----
> From: pgsql-sql-owner@postgresql.org
> [mailto:pgsql-sql-owner@postgresql.org] On Behalf Of Leif B.
> Kristensen
> Sent: Thursday, September 22, 2005 2:12 PM
> To: pgsql-sql@postgresql.org
> Subject: Re: [SQL] Help with a view
>
>
> On Thursday 22 September 2005 20:03, Dmitri Bichko wrote:
>
> > SELECT * FROM principals WHERE event = 15821 AND person != 2?
>
> Sure, that's a concise answer to what I actually wrote, but it wasn't
> exactly what I intended :)
>
> Basically, what I've got is the first person and the
> tag_type. I can do
> it with a function from PHP:
>
> function get_spouses($p) {
> $handle = pg_query("select person from principals
> where event in (select event from principals
> where person = $p and tag_type = " .MARR. ")
> order by sort_date");
> $i=0;
> $spouses = array();
> while ($row = pg_fetch_row($handle) {
> if $row[0] != $p
> $spouses[$i++] = $row[0];
> }
> return $spouses;
> }
>
> But this is *ugly* ...
> --
> Leif Biberg Kristensen
> http://solumslekt.org/
>
> ---------------------------(end of
> broadcast)---------------------------
> TIP 5: don't forget to increase your free space map settings
>
The information transmitted is intended only for the person or entity to which it is addressed and may contain
confidentialand/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any
actionin reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you
receivedthis in error, please contact the sender and delete the material from any computer