SQL Clone
SQLServerCentral is supported by Redgate
 
Log in  ::  Register  ::  Not logged in
 
 
 


amount difference between 2 dats


amount difference between 2 dats

Author
Message
mathewspsimon
mathewspsimon
SSC Veteran
SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)

Group: General Forum Members
Points: 241 Visits: 231
Hi All,

I have a table like this

Date Amount
09/01/2008 500
09/02/2008 1500
09/03/2008 3500

I want a output which is as follows -
Date Amount
09/02/2008 1000
09/03/2008 2000

where the amount column is the diference from the previous date so in this example 2nd sept amount is the difference bet 2nd and 1st sept so also for 3rd sept amount.

Can some help to write a query for this.
ChrisM@Work
ChrisM@Work
SSC-Forever
SSC-Forever (43K reputation)SSC-Forever (43K reputation)SSC-Forever (43K reputation)SSC-Forever (43K reputation)SSC-Forever (43K reputation)SSC-Forever (43K reputation)SSC-Forever (43K reputation)SSC-Forever (43K reputation)

Group: General Forum Members
Points: 43105 Visits: 20015
Hi Mathew

What do you have in the way of pk / indexes in this table?

Cheers

ChrisM

“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
Exploring Recursive CTEs by Example Dwain Camps
mathewspsimon
mathewspsimon
SSC Veteran
SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)

Group: General Forum Members
Points: 241 Visits: 231
no PK and Indexes are there.
ChrisM@Work
ChrisM@Work
SSC-Forever
SSC-Forever (43K reputation)SSC-Forever (43K reputation)SSC-Forever (43K reputation)SSC-Forever (43K reputation)SSC-Forever (43K reputation)SSC-Forever (43K reputation)SSC-Forever (43K reputation)SSC-Forever (43K reputation)

Group: General Forum Members
Points: 43105 Visits: 20015
mathewspsimon (9/11/2008)
no PK and Indexes are there.


That pretty much identifies this as a homework question. Rather than solve this for you, here's an article which discusses more than one method for dealing with this type of problem, and the relative merits and drawbacks of each. Read the article, try one or two of the methods, and if you're still unsure, then repost. Good luck!

http://www.sqlservercentral.com/articles/Advanced+Querying/61716/

Cheers

ChrisM

“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
Exploring Recursive CTEs by Example Dwain Camps
GilaMonster
GilaMonster
SSC Guru
SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)

Group: General Forum Members
Points: 234303 Visits: 46368
2000 or 2005?
What happens if a date is missing?

Is it homework?

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


mathewspsimon
mathewspsimon
SSC Veteran
SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)

Group: General Forum Members
Points: 241 Visits: 231
this is 2000 and its not homework.the first table is a sales table which gets updated w when a sale happnes.to arrive at the sale for a specific date I have to get the difference from previous date.
also these were created,triggers wrote before.i will not be able to modifiy them
GilaMonster
GilaMonster
SSC Guru
SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)

Group: General Forum Members
Points: 234303 Visits: 46368
Please post SQL 2000 questions in the SQL 2000 forums in the future. Posting in the 2005 forums means that people will give you 2005-specific solutions.

Are the dates always consecutive? Is it possible for there ever to be a date missing? Do the dates have various times associated with them, or is the time always set to midnight?

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


mathewspsimon
mathewspsimon
SSC Veteran
SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)

Group: General Forum Members
Points: 241 Visits: 231
Hi,

Yes,dates can miss and it is not consecutive.Also dates are all midnight.
GilaMonster
GilaMonster
SSC Guru
SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)SSC Guru (234K reputation)

Group: General Forum Members
Points: 234303 Visits: 46368
Any chance of duplicate dates?

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


mathewspsimon
mathewspsimon
SSC Veteran
SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)SSC Veteran (241 reputation)

Group: General Forum Members
Points: 241 Visits: 231
no chance for duplicates
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