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Home -> Community -> Mailing Lists -> Oracle-L -> Case Statement
Good morning everyone,
Has anyone used the case statement against a ton of data (like below)? I"m wondering if it's slow. I found that RANK() could be slow if it was running against a larger dataset.
Any insights are appreciated.
Thanks
Lisa Koivu
The Vicodin-enhanced DBA
-----Original Message-----
From: Ron Thomas [SMTP:rthomas_at_hypercom.com] Sent: Tuesday, July 24, 2001 5:36 PM To: Multiple recipients of list ORACLE-LSubject: RE: Need SQL Example
If you are on 8, then you can use case. Here is a simple example.
<snippet>
SUM(
CASE
WHEN TRUNC(SYSDATE)-APS.due_date < 1 THEN
DECODE(AI.exchange_rate,
NULL, APS.amount_remaining,
ROUND(AI.exchange_rate*APS.amount_remaining,2))
ELSE
0
END ) payment_due_current,
SUM(
CASE
WHEN TRUNC(SYSDATE)-APS.due_date BETWEEN 1 AND 30 THEN
DECODE(AI.exchange_rate,
NULL, APS.amount_remaining,
ROUND(AI.exchange_rate*APS.amount_remaining,2))
ELSE
0
END ) payment_due_1_30,
SUM(
CASE
WHEN TRUNC(SYSDATE)-APS.due_date BETWEEN 31 AND 60 THEN
DECODE(AI.exchange_rate,
NULL, APS.amount_remaining,
ROUND(AI.exchange_rate*APS.amount_remaining,2))
ELSE
0
END ) payment_due_31_60,
SUM(
CASE
WHEN TRUNC(SYSDATE)-APS.due_date > 60 THEN
DECODE(AI.exchange_rate,
NULL, APS.amount_remaining,
ROUND(AI.exchange_rate*APS.amount_remaining,2))
ELSE
0
END ) payment_due_60,
</SNIPPET>
Ron Thomas
Hypercom, Inc
rthomas_at_hypercom.com
"I'm too sexy for my code." - Awk Sed Fred
epost_at_kcc.com
Sent by: To: ORACLE-L_at_fatcity.com
root_at_fatcity. cc:
com Subject: RE: Need SQL Example
07/24/01
12:20 PM
Please
respond to
ORACLE-L
Yeah that one is great, thanks. - Ethan
-----Original Message-----
Sent: Tuesday, July 24, 2001 11:28 AM
To: Multiple recipients of list ORACLE-L
"Post, Ethan" wrote:
> > Anyone got a good example of flipping a range of values into columner > buckets. I have done this in the past but my solutions always seem so > convoluted, it seems I have seen more elegant examples in the past. Iwant
> to use decode so it will run on older versions of Oracle. > > Pseudo Example: > > select > sum(decode(if value between 0 and 64 then return 1 else 0)) > count_of_this_bucket, > sum(decode(if value between 65 and 128 then return 1 else 0)) > count_of_this_bucket,... > from > table > > Thanks, > Ethan
select sum(decode(sign(value - 64), 1, 0, 1)) count_of_this_bucket,
sum(decode(sign(value - 129) * sign(value - 64), -1, 1, 0))
count_of_this_bucket,...
Not certain that it is as elegant as you wish, but easy to decline.
-- Regards, Stephane Faroult Oriole Corporation Voice: +44 (0) 7050-696-269 Fax: +44 (0) 7050-696-449 Performance Tools & Free Scripts -------------------------------------------------------------- http://www.oriole.com, designed by Oracle DBAs for Oracle DBAs -------------------------------------------------------------- -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Stephane FaroultReceived on Wed Jul 25 2001 - 07:51:41 CDT
INET: sfaroult_at_oriole.com
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