Solved

Problem in selecting max of a varchar datatype value

Posted on 2010-11-17
10
316 Views
Last Modified: 2012-05-10
Hi,

I have a table in sqlserver 2008 with a auto generated column as varchar. these are the sample values
max1
max2
max3
.
.
.
.
max98
max99
max100

when i try to select the max value of the above column, it give only as max99 but it should give us max100.

please let me know an solution to find out max of a varchar datatype value

thanks,
Rajesh
0
Comment
Question by:rajeshmarappan
  • 3
  • 2
  • 2
  • +2
10 Comments
 
LVL 142

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 34155845
that column should really be splitted into 2 columns ...

apart from that:
select max( cast( substring(yourfield, 4, 100) as bigint) )
  from yourtable

Open in new window

0
 
LVL 51

Expert Comment

by:HainKurt
ID: 34155916
or if they all start with 'max'

select max(cast(replace(col,'max','') as int)) from yourTable
0
 
LVL 23

Expert Comment

by:Rajkumar Gs
ID: 34155941
You need one more column to indicate the number.

For current data, if 'max' is hardcoded, you can try this query as well

select 'max' + cast( max( cast( right(yourcolumn, len(yourcolumn) - 3) as int)) as varchar(25)) from yourtable

Open in new window


Regards
Raj
0
Migrating Your Company's PCs

To keep pace with competitors, businesses must keep employees productive, and that means providing them with the latest technology. This document provides the tips and tricks you need to help you migrate an outdated PC fleet to new desktops, laptops, and tablets.

 
LVL 92

Expert Comment

by:Patrick Matthews
ID: 34156257
Rajesh,

>>please let me know an solution to find out max of a varchar datatype value

Actually, in a text comparison, 'max99' > 'max100'.

Just as 'max2' > 'max100'

:)

Patrick
0
 

Author Comment

by:rajeshmarappan
ID: 34156314
Hi,

Above solutions are working fine. but we need the same solution for linq query where we cant use CAST. please let me know.

Regards,
Rajesh
0
 
LVL 142

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 34156354
not sure if that can be done in LINQ ...

so basically, I come back to my initial post:

that column should really be splitted into 2 columns ...
0
 
LVL 23

Expert Comment

by:Rajkumar Gs
ID: 34156451
Right.
Things will be easy, if you have one more integer column so that you can find the maximum value

Raj
0
 
LVL 51

Accepted Solution

by:
HainKurt earned 250 total points
ID: 34156591
you can use one of these (not tested)

col.Remove(0,3) * 1

col.Replace('max','') * 1

col.Substring(3) * 1

so it removes first 3 letters 'max', then multiplies it with 1 makes it (or should make number) then sort it...

check here for string functions: http://msdn.microsoft.com/en-us/vbasic/bb737939.aspx#strsubst
0
 
LVL 51

Assisted Solution

by:HainKurt
HainKurt earned 250 total points
ID: 34156648
or do this

('0000000' + col.Replace('max','000')).Substring(10-col.Length)

the idea is convert

max1     : 0000000001
max23   : 0000000023
max100 : 0000000100

so sorting will be correct without casting ;)

0
 

Author Closing Comment

by:rajeshmarappan
ID: 34164725
Partially Solved my problem
0

Featured Post

Three Reasons Why Backup is Strategic

Backup is strategic to your business because your data is strategic to your business. Without backup, your business will fail. This white paper explains why it is vital for you to design and immediately execute a backup strategy to protect 100 percent of your data.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
SQL Statement to Update Email Domain 2 30
SQL Server merge records in one table 2 21
SQL Server 2012 r2 Make faster Temp Table 17 104
convert null in sql server 12 33
INTRODUCTION: While tying your database objects into builds and your enterprise source control system takes a third-party product (like Visual Studio Database Edition or Red-Gate's SQL Source Control), you can achieve some protection using a sing…
In this article I will describe the Backup & Restore method as one possible migration process and I will add the extra tasks needed for an upgrade when and where is applied so it will cover all.
This Micro Tutorial hows how you can integrate  Mac OSX to a Windows Active Directory Domain. Apple has made it easy to allow users to bind their macs to a windows domain with relative ease. The following video show how to bind OSX Mavericks to …
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…

776 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