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SQL Server Number Incrementation Function

Posted on 2007-03-24
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Last Modified: 2010-03-19
Hi all,

I have a database table in SQL Server 2005 where I have a field called JobNumber and is set to type decimal(18,3) so that I can create job numbers in the format of 6000.000.

What I want to do is everytime I add a new job to the system using a stored proc is get the last job number and add either 5 or 7 to it. If its a sub job then I would just like to add .001 to the number.

Example:

Job number starts at 6000.000 and I add a job I would like the job number to randomly select the number 5 or 7 and then add it to the current job number and save this as the new job number so we would have 6005.000 or 6007.000.

If I identify the job as a sub job then I just want to increment this by adding .001 so it would be 6000.001.

Any help on how to achive this within SQL Server would be very helpful. I was thinking of using some form of function to do this but I am sure there is some knowledgable SQL Server expert out there who can tell me if this is the way to go or not.

Many thanks

Cragly

 
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Question by:Cragly
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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 18785805
>I have a field called JobNumber and is set to type decimal(18,3) so that I can create job numbers in the format of 6000.000.

I would rather suggest to make that 2 fields, 1 for jobnumber, and a second field for job sub step for example, both int. also, the sub jobs should eventually be defined in a second table, but without know exactly what this job stuff is all above, it's difficult/impossible to give a definitive answer.

I am very curious to know why you want not a purely incremental (+1) sequence, but +5/+7...



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Author Comment

by:Cragly
ID: 18785874
Many thanks for getting back to me so quickly its much appreciated.

The reason behind the +5/+7 is that my client uses the job number as an invoice number and he never uses just +1. He is very creative with his invoices so as not to look like he is doing all his work with just one client.

I agree with what you say regarding splitting up the numbers into seperate fields and I will have a Jobs table with number and subNumber.

What I now need to do is create a function that gets the highest job number and then randomly selects 5 or 7 and does the addition and returns it back to the calling sproc to use as the new job number.

All I need to do now is find out how to select 5 or 7 randomly within the function.

Any ideas??

Cheers

Cragly
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LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 2000 total points
ID: 18785910
to get a random number, you can inspire yourself here:
http://www.drdev.net/article07.htm

to get the highest existing number, use  
declare @r int
SELECT @r = FLOOR(MAX(jobnumber)) from yourtable

and add the random value as needed.
you can put that of course into a function.
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Author Comment

by:Cragly
ID: 18785929
Many thanks for your help Angel what a star
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