From: | Robert Buckley <robertdbuckley(at)yahoo(dot)com> |
---|---|
To: | salah jubeh <s_jubeh(at)yahoo(dot)com>, "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: Create loop in postgresql |
Date: | 2012-09-03 16:33:07 |
Message-ID: | 1346689987.49758.YahooMailNeo@web133003.mail.ir2.yahoo.com |
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Thread: | |
Lists: | pgsql-general |
Thanks....that worked a treat!
cheers,
Rob
________________________________
Von: salah jubeh <s_jubeh(at)yahoo(dot)com>
An: Robert Buckley <robertdbuckley(at)yahoo(dot)com>; "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org>
Gesendet: 18:23 Montag, 3.September 2012
Betreff: Re: [GENERAL] Create loop in postgresql
Hello Robert,
I just gave an example and this also can be optimized . but let me first clarify one thing here.
since you have the same behaviour for all values , there is no need to use case in the first place. So just drop it.
I think below would be the correct syntax
select name,ges_kw_zgb, (SELECT round(100 * (ges_kw_zgb / (select sum(ges_kw_zgb) From energie.tennet_auswertung_2010)),2)) FROM
energie.tennet_auswertung_2010;
Regards
________________________________
From: Robert Buckley <robertdbuckley(at)yahoo(dot)com>
To: salah jubeh <s_jubeh(at)yahoo(dot)com>; "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org>
Sent: Monday, September 3, 2012 6:06 PM
Subject: Re: [GENERAL] Create loop in postgresql
this give an error.
select name,ges_kw_zgb, SELECT round(100 * (ges_kw_zgb / (select sum(ges_kw_zgb) From energie.tennet_auswertung_2010)),2);
ERROR: syntax error at or near "SELECT"
LINE 2: select name,ges_kw_zgb, SELECT round(100 * (ges_kw_zgb / (se...
________________________________
Von: salah jubeh <s_jubeh(at)yahoo(dot)com>
An: Robert Buckley <robertdbuckley(at)yahoo(dot)com>; "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org>
Gesendet: 17:45 Montag, 3.September 2012
Betreff: Re: [GENERAL] Create loop in postgresql
I am wondering why do not you write it like this
select name,ges_kw_zgb, select round(100 * (ges_kw_zgb / (select sum(ges_kw_zgb) From energie.tennet_auswertung_2010)),2) ......
Regards
________________________________
From: Robert Buckley <robertdbuckley(at)yahoo(dot)com>
To: "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org>
Sent: Monday, September 3, 2012 5:30 PM
Subject: [GENERAL] Create loop in postgresql
Hi,
I am trying to loop through the records in a table and update a column. I can do this with a case statement but I would like to simplify this to a simple loop statement. I can´t seem to work out how to do it though.
Here is the case statement.
select name,ges_kw_zgb,
case
When name='Bad Harzburg' then (select round(100 * (ges_kw_zgb / (select sum(ges_kw_zgb) From energie.tennet_auswertung_2010)),2))
When name='Braunlage' then (select round(100 * (ges_kw_zgb / (select sum(ges_kw_zgb) From energie.tennet_auswertung_2010)),2))
When name='Braunschweig' then (select round(100 * (ges_kw_zgb / (select sum(ges_kw_zgb) From energie.tennet_auswertung_2010)),2))
When name='Büddenstedt' then (select round(100 * (ges_kw_zgb / (select sum(ges_kw_zgb) From energie.tennet_auswertung_2010)),2))
End as z
from energie.tennet_auswertung_2010
;
Instead of having to write the name variable in the function, I would just like to iterate through each record and execute the select round(100 * (ges_kw_zgb / (select sum(ges_kw_zgb) From energie.tennet_auswertung_2010)),2) command.
If anyone can help I´d me grateful,
cheers,
Rob
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