Solved

SQL string iteration function

Posted on 2013-05-20
3
660 Views
Last Modified: 2013-05-20
Morning,
I have the following values in a table which I need to extract the numerical value combinations. All the values follow the same pattern with underscores.
A-FP_1234_5678_EF
Can I pls have some help to create a simple function that will loop thru and return the 2 sets of numbers from the passed string being 1234 and 5678

Thanks
0
Comment
Question by:CraigLazar
3 Comments
 
LVL 16

Accepted Solution

by:
Surendra Nath earned 300 total points
ID: 39180387
give it a whirl

create function dbo.slice
(
 @t varchar(1000)
)
returns @slicedRows Table
(
  NumbericalPart    BIGINT
)
AS
BEGIN
declare @first_ int 
declare @second_ int 
declare @third_ int 

set @first_ = charindex('_',@t)
set @second_ = charindex('_',@t,@first_ + 1 )
set @third_ = charindex('_',@t,@second_ + 1 )
insert into  @slicedRows 
select CAST(substring(@t,@first_+1,@second_- @first_-1) as BIGINT)
UNION ALL
select CAST(substring(@t,@second_+1,@third_-@second_-1) as BIGINT)
return
END

Open in new window


the values are returned when you do the below

select * from dbo.slice('A-FP_1234_5678_EF')

Open in new window


Remember the function does return a table so, you need to do a cross apply if want to join it in a where clause.
0
 
LVL 8

Expert Comment

by:jpgobert
ID: 39180390
There may be a better way but here's what I'm thinking...  If your data always follows that format then you have three underscore characters that you need to know the positions of.

Declare @POS1 int  //position of the first _
Declare @POS2 int  //position of the second _
Declare @POS3 int  //position of the third _
Declare @NumberSet1 varchar(10)  //First string of #'s
Declare @NumberSet2 varchar(10)  //Second string of #'s

// You can use something other than varchar in the last two... i don't know your data...

// The next three lines will set the positions of the _ chars into the three variables

Set @POS1 = CharIndex("_", string, 1)
Set @POS2 = CharIndex("_", string, @POS1+1)
Set @POS3 = CharIndex("_", string, @POS2+1)

// Now that you know where the _ characters are you can use substring to capture them

Set @NumberSet1 = SubString(string, (@POS1+1), (@POS2 - @POS1 - 1))
Set @NumberSet2 = SubString(string, (@POS2 + 1), (@POS3 - @POS2 - 1))


Hope it helps...
0
 
LVL 4

Author Closing Comment

by:CraigLazar
ID: 39180558
Thanks Neo, perfect, just made some adjustements, returning BIGINT instead of table and created 2 functions each for number 1 and number 2
0

Featured Post

What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

Question has a verified solution.

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

Use this article to create a batch file to backup a Microsoft SQL Server database to a Windows folder.  The folder can be on the local hard drive or on a network share.  This batch file will query the SQL server to get the current date & time and wi…
Ever needed a SQL 2008 Database replicated/mirrored/log shipped on another server but you can't take the downtime inflicted by initial snapshot or disconnect while T-logs are restored or mirror applied? You can use SQL Server Initialize from Backup…
Using examples as well as descriptions, and references to Books Online, show the documentation available for datatypes, explain the available data types and show how data can be passed into and out of variables.
Viewers will learn how to use the INSERT statement to insert data into their tables. It will also introduce the NULL statement, to show them what happens when no value is giving for any given column.

803 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