Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

how 2 catch divide by zero

Posted on 2000-03-30
11
Medium Priority
?
529 Views
Last Modified: 2012-06-21
I am trying to create a view; one of the columns is meant to be a calculated profit percentage for the month to date sales.

e.g.

MONTH_PROF_PERC =
(i.SALES_CURMONTH - i.SALES_COST_CURMONTH) / i.SALES_CURMONTH

[i is an alias for inventory table]
However, sometimes a product hasn't sold anything for that month, so the view barfs with a divide by zero error, and hence nothing shows up.

in a real language (I hate SQL) I would simply say something like:

MONTH_PROF_PERC =
if( i.SALES_CURMONTH > 0)
    then
(i.SALES_CURMONTH - i.SALES_COST_CURMONTH) / i.SALES_CURMONTH
    else
0

There must be a way to code this using SQL, perhaps as a subquery? NOTE: I can't add a where clause that prevents records where  i.SALES_CURMONTH <= 0 from showing up, that would drop certain products that have been selling great all year, but maybe not yet this month.

Thanks!

p.s. I'm using Sybase Adaptive Server Enterprise 11.9.2
0
Comment
Question by:stoneman
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 3
  • 2
  • +2
11 Comments
 

Expert Comment

by:Alex_nl
ID: 2672193
Could you use a case statement here?

Something like:

MONTH_PROF_PERC = CASE i.SALES_CURMONTH WHEN 0 THEN 0 ELSE (i.SALES_CURMONTH - i.SALES_COST_CURMONTH) / i.SALES_CURMONTH END

There may be a better syntax for this but I don't have the Online Books installed here...

HTH,
Alex
0
 

Expert Comment

by:csabay
ID: 2672851
Hi,

there is also an if-syntax to use in Sybase:

if i.sales_curmonth = 0
    month_prof_perc = 0
else
    month_prof_perc = ... &c

Charles
0
 
LVL 1

Author Comment

by:stoneman
ID: 2676994
Sorry, neither of these suggestions helped. The whole context of what I am trying to do is here:

CREATE VIEW INV_ANALYSIS
AS
SELECT  i.VENDOR_6,  
        i.SKU,  
        MONTH_PROFIT = (i.SALES_CURMONTH - i.SALES_COST_CURMONTH),
        MONTH_PROF_PERC = (i.SALES_CURMONTH - i.SALES_COST_CURMONTH) / i.SALES_CURMONTH
FROM INVENTORY i
WHERE i.SALES_CURYEAR > 0


When I put either of the above into suggestions into the line for MONTH_PROF_PERC I get a syntax error near keyword if.




0
Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

 

Expert Comment

by:Alex_nl
ID: 2679123
Hi stoneman,
I'm pretty sure this will work:

CREATE VIEW INV_ANALYSIS
AS
SELECT  i.VENDOR_6,  
        i.SKU,  
        MONTH_PROFIT = (i.SALES_CURMONTH - i.SALES_COST_CURMONTH),
        MONTH_PROF_PERC = CASE i.SALES_CURMONTH
                                                      WHEN 0 THEN 0 ELSE
                                                            (i.SALES_CURMONTH - i.SALES_COST_CURMONTH) / i.SALES_CURMONTH
                                                      END
FROM INVENTORY i
WHERE i.SALES_CURYEAR > 0
0
 

Expert Comment

by:shabbirab
ID: 2770635
Just add a condition as under and this should work.

MONTH_PROF_PERC = (i.SALES_CURMONTH - i.SALES_COST_CURMONTH) / ISNULL(i.SALES_CURMONTH , 1)
AND MONTH_PROF_PERC != (i.SALES_CURMONTH - i.SALES_COST_CURMONTH)
0
 

Expert Comment

by:shabbirab
ID: 2770641
A little too fast on that ..
Give me some time.

0
 

Expert Comment

by:shabbirab
ID: 2770677
A little too fast on that ..
Give me some time.

0
 
LVL 1

Author Comment

by:stoneman
ID: 2829408
None of these suggestions worked, sybase wouldn't
t let me save the create view. I've resorted to performing a check in my Java code instead. Thanks for the tries though!

0
 
LVL 3

Expert Comment

by:knel1234
ID: 2872278
stoneman,

Are you still looking for an answer?

knel1234
0
 
LVL 1

Author Comment

by:stoneman
ID: 2913088
Sure, but I'm convinced at this point it can't be done. My solution was to add a SALES_CURMONTH > 0 to the where clause. This stopped records that could produce the divide by zero, but my client wasn't too happy. It means items that are still top sellers, but for some reason haven't sold anything this month yet, would not show up in the report. If you can figure it out I'd double the points.

-stoneman
0
 

Accepted Solution

by:
shabbirab earned 80 total points
ID: 2915433
If you do a Union of the Same Query with the condition SALES_CURMONTH <= 0, it should work. I mean ...

SELECT ....
MONTH_PROF_PERC =  (i.SALES_CURMONTH - i.SALES_COST_CURMONTH) / i.SALES_CURMONTH
FROM ...
WHERE ...
AND SALES_CURMONTH > 0
UNION
SELECT ....
MONTH_PROF_PERC =  0
FROM ...
WHERE ...
AND SALES_CURMONTH <= 0
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Article by: evilrix
Looking for a way to avoid searching through large data sets for data that doesn't exist? A Bloom Filter might be what you need. This data structure is a probabilistic filter that allows you to avoid unnecessary searches when you know the data defin…
Let's take a look into the basics of ransomware—how it spreads, how it can hurt us, and why a disaster recovery plan is important.
In this video you will find out how to export Office 365 mailboxes using the built in eDiscovery tool. Bear in mind that although this method might be useful in some cases, using PST files as Office 365 backup is troublesome in a long run (more on t…
In this video, Percona Solutions Engineer Barrett Chambers discusses some of the basic syntax differences between MySQL and MongoDB. To learn more check out our webinar on MongoDB administration for MySQL DBA: https://www.percona.com/resources/we…

610 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question