Click here to monitor SSC
SQLServerCentral is supported by Redgate
 
Log in  ::  Register  ::  Not logged in
 
 
 


Storing Negative Numbers


Storing Negative Numbers

Author
Message
tymberwyld
tymberwyld
SSC Veteran
SSC Veteran (284 reputation)SSC Veteran (284 reputation)SSC Veteran (284 reputation)SSC Veteran (284 reputation)SSC Veteran (284 reputation)SSC Veteran (284 reputation)SSC Veteran (284 reputation)SSC Veteran (284 reputation)

Group: General Forum Members
Points: 284 Visits: 274
Along with a lot of other horrible decisions, I am now not allowed to use Negative numbers in any database design. Instead, I need to add another column (ex. Operator) which tells whomever that the data in the amount column is either Positive or Negative. Huh? Is there something I missed during my last 10 years designing databases?



GilaMonster
GilaMonster
SSC-Forever
SSC-Forever (47K reputation)SSC-Forever (47K reputation)SSC-Forever (47K reputation)SSC-Forever (47K reputation)SSC-Forever (47K reputation)SSC-Forever (47K reputation)SSC-Forever (47K reputation)SSC-Forever (47K reputation)

Group: General Forum Members
Points: 47402 Visits: 44399
Do they have a reason for this decision?


Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass


Ronald H
Ronald H
Ten Centuries
Ten Centuries (1.1K reputation)Ten Centuries (1.1K reputation)Ten Centuries (1.1K reputation)Ten Centuries (1.1K reputation)Ten Centuries (1.1K reputation)Ten Centuries (1.1K reputation)Ten Centuries (1.1K reputation)Ten Centuries (1.1K reputation)

Group: General Forum Members
Points: 1131 Visits: 612
Are you trying to say you're looking for another job? Or that the company you work for is just positive by design?

Ronald Hensbergen

Help us, help yourself... Post data so we can read and use it: http://www.sqlservercentral.com/articles/Best+Practices/61537/
-------------------------------------------------------------------------
2+2=5 for significant large values of 2
Grant Fritchey
Grant Fritchey
SSCoach
SSCoach (17K reputation)SSCoach (17K reputation)SSCoach (17K reputation)SSCoach (17K reputation)SSCoach (17K reputation)SSCoach (17K reputation)SSCoach (17K reputation)SSCoach (17K reputation)

Group: General Forum Members
Points: 17641 Visits: 32268
Not unless I've missed it to. If the value of a number is -3, it's -3, not 3 with some negative sign kept elsewhere that may or may not change it. That's a bit of a freaky design. Although, I'd have to check with an accounting friend for the details, I think there is a method of accounting whereby you designate everything as a value and then describe the value as either a credit or debit, + or -, maybe that's what you're dealing with.

----------------------------------------------------
The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood...
Theodore Roosevelt

The Scary DBA
Author of: SQL Server Query Performance Tuning and SQL Server Execution Plans
Product Evangelist for Red Gate Software
tymberwyld
tymberwyld
SSC Veteran
SSC Veteran (284 reputation)SSC Veteran (284 reputation)SSC Veteran (284 reputation)SSC Veteran (284 reputation)SSC Veteran (284 reputation)SSC Veteran (284 reputation)SSC Veteran (284 reputation)SSC Veteran (284 reputation)

Group: General Forum Members
Points: 284 Visits: 274
Basically what's going on here is that someone is looking at some wireframes of the UI and that's getting translated directly into a database design. If they want to give users an easy way to enter Postive / Negative amounts, by all means, give them a stupid designator / operator selector. However, that should not be how it's stored in the database. As far as accounting goes, I understand your point, but I would think that all Credits would be stored as Negative amounts, yes?



Lynn Pettis
Lynn Pettis
SSC-Insane
SSC-Insane (24K reputation)SSC-Insane (24K reputation)SSC-Insane (24K reputation)SSC-Insane (24K reputation)SSC-Insane (24K reputation)SSC-Insane (24K reputation)SSC-Insane (24K reputation)SSC-Insane (24K reputation)

Group: General Forum Members
Points: 24276 Visits: 37986
tymberwyld (11/10/2008)
Basically what's going on here is that someone is looking at some wireframes of the UI and that's getting translated directly into a database design. If they want to give users an easy way to enter Postive / Negative amounts, by all means, give them a stupid designator / operator selector. However, that should not be how it's stored in the database. As far as accounting goes, I understand your point, but I would think that all Credits would be stored as Negative amounts, yes?


Not all credits are negative. It depends if they are expenses, liabilities, or assests.

Cool
Lynn Pettis

For better assistance in answering your questions, click here
For tips to get better help with Performance Problems, click here
For Running Totals and its variations, click here or when working with partitioned tables
For more about Tally Tables, click here
For more about Cross Tabs and Pivots, click here and here
Managing Transaction Logs

SQL Musings from the Desert Fountain Valley SQL (My Mirror Blog)
tymberwyld
tymberwyld
SSC Veteran
SSC Veteran (284 reputation)SSC Veteran (284 reputation)SSC Veteran (284 reputation)SSC Veteran (284 reputation)SSC Veteran (284 reputation)SSC Veteran (284 reputation)SSC Veteran (284 reputation)SSC Veteran (284 reputation)

Group: General Forum Members
Points: 284 Visits: 274
Lynn Pettis (11/10/2008)
Not all credits are negative. It depends if they are expenses, liabilities, or assests.


True, sorry, my Accounting knowledge is only so-so Smile



Jeff Moden
Jeff Moden
SSC-Forever
SSC-Forever (45K reputation)SSC-Forever (45K reputation)SSC-Forever (45K reputation)SSC-Forever (45K reputation)SSC-Forever (45K reputation)SSC-Forever (45K reputation)SSC-Forever (45K reputation)SSC-Forever (45K reputation)

Group: General Forum Members
Points: 45382 Visits: 39938
Heh... if you really want to throw a ball of wax at them before you decide to find a place with reasonable requirements, tell them the column should be named "IsNotNegative"... BigGrinWinkHehew00t

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
Matt Miller (#4)
Matt Miller (#4)
SSCertifiable
SSCertifiable (7.7K reputation)SSCertifiable (7.7K reputation)SSCertifiable (7.7K reputation)SSCertifiable (7.7K reputation)SSCertifiable (7.7K reputation)SSCertifiable (7.7K reputation)SSCertifiable (7.7K reputation)SSCertifiable (7.7K reputation)

Group: General Forum Members
Points: 7662 Visits: 18097
This would bring out the old Bastard DBA from Hell in me. Just encrypt all of the views and all outputs from the DB, calling it a new SOX measure, then mention that they must talk to SEcurity to get their own personal security code to decrypt the output.....

Or -

Comply with the request, and store every number in Hex form, again refusing to convert it back to decimal for output purposes.....

(it's been one of them days, so probably best not to heed any of this advice....Smile)

----------------------------------------------------------------------------------
Your lack of planning does not constitute an emergency on my part...unless you're my manager...or a director and above...or a really loud-spoken end-user..All right - what was my emergency again?
krayknot
krayknot
Old Hand
Old Hand (348 reputation)Old Hand (348 reputation)Old Hand (348 reputation)Old Hand (348 reputation)Old Hand (348 reputation)Old Hand (348 reputation)Old Hand (348 reputation)Old Hand (348 reputation)

Group: General Forum Members
Points: 348 Visits: 534
tymberwyld (11/10/2008)
Basically what's going on here is that someone is looking at some wireframes of the UI and that's getting translated directly into a database design. If they want to give users an easy way to enter Postive / Negative amounts, by all means, give them a stupid designator / operator selector. However, that should not be how it's stored in the database. As far as accounting goes, I understand your point, but I would think that all Credits would be stored as Negative amounts, yes?


whatever the value and the operator the user selects. you multiply that value by -1.
for example
user entered 100 and selects '-'
the output would be: 100 * -1 = -100
or 100 * 1 =100 or no change

am i correct?

kshitij kumar
kshitij@krayknot.com
www.krayknot.com
Go


Permissions

You can't post new topics.
You can't post topic replies.
You can't post new polls.
You can't post replies to polls.
You can't edit your own topics.
You can't delete your own topics.
You can't edit other topics.
You can't delete other topics.
You can't edit your own posts.
You can't edit other posts.
You can't delete your own posts.
You can't delete other posts.
You can't post events.
You can't edit your own events.
You can't edit other events.
You can't delete your own events.
You can't delete other events.
You can't send private messages.
You can't send emails.
You can read topics.
You can't vote in polls.
You can't upload attachments.
You can download attachments.
You can't post HTML code.
You can't edit HTML code.
You can't post IFCode.
You can't post JavaScript.
You can post emoticons.
You can't post or upload images.

Select a forum

































































































































































SQLServerCentral


Search