Question

Identify Part Numbers from String

Asked by: ShadowIT

Hello Experts,
I am mining data from an ERP system.  The users of this system are not using the ERP's part number field and are instead entering the part numbers, along with other data (model, part description), in a free form text description field within the ERP's PO line items.  As a result I have a ton of user embellishments occurring within the data set (ex. part # 12345-AB, P/N#1234AB...sometimes the part numbers are in the middle or at the end of the string) etc.  So I need a way to extract the part numbers from this string of data.  I've considered SoundEx but just cant seem to wrap my mind around a design approach.  What I could do is have each supplier provide me a valid list of part numbers and then attempt to use SoundEx to perform the comparison.  Then, and this is just conceptual, construct some sort of UI to allow users to review/improve the accuracy of the results by overriding the automated weighing results when appropriate.  Please understand that I am contending with legacy/existing data...it is what it is.  Please, comments like, "why don't they just use the part number field?" aren't helpful.  The path forward to resolve this issue going forward is being addressed, but I still need some way to contend with the existing data...such as it is.  Thank you

p.s. It should be noted that the part numbers are numeric, alpha and alpha-numeric.  We're talking ~15 thousand suppliers.

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Asked On
2009-10-30 at 19:12:28ID24860143
Tags

Access 2003

,

MS SQL

Topics

MS SQL Server

,

Microsoft Access Database

,

Databases Miscellaneous

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Answers

 

by: Allister_ReidPosted on 2009-10-30 at 20:25:35ID: 25708227

Hi,
What makes you think Soundex will help here?  Do the part numbers sound like each other?

It doesn't sound like this is going to be an option with so many suppliers - and presumably a highly heterogenous sampling of part numbers...  is the "P/N" or "part #" regular to all records?

Regular expression may be a possible solution.

However, there probably is going to be no easy answer here :S


Regards

 

by: Ralph_AveryPosted on 2009-10-30 at 20:39:22ID: 25708269

Sounds like you have your work cut out.   I have a similar issue (fortunately, mine's a little smaller subset of data, and my results will all be numeric).  

What I've done, is create a new column for the correct value.   Then I started cleaning up everything I could and putting the correct values in the new column.   You may be able to write a job to parse out the numeric portions of the field to at least give you that.    If there's another column that identifies the vendor, you can set up a regex in a separate table to match each vendor's part number pattern.  

The second column I created is used by using "Isnull(newcolumn, oldcolumn)" in my queries, to give me the good number, and if it doesn't exist, then the dirty number.    That along with training and strict constraints.    

 

by: cactus_dataPosted on 2009-10-31 at 01:17:46ID: 25708859

Use InStr() to look up the position of a "#" mark.
From that position + 2, again using InStr, look up the first space.
The string between these is your part no. Use Mid to extract it.

/gustav

 

by: jjafferrPosted on 2009-10-31 at 05:55:47ID: 25709553

since you have more than one # in the field,
change gustav's firt line from:
Use InStr() to look up the position of a "#" mark.
to
Use InStr() to look up the position of a "part#"

jaffer

 

by: datAdrenalinePosted on 2009-10-31 at 08:29:34ID: 25710109

First off ... if you can do as you said...
>> What I could do is have each supplier provide me a valid list of part numbers and then attempt to use SoundEx to perform the comparison <<

But .. you would not use SoundEx(), you would use the LIKE operator ...

... WHERE [YourFreeTextField] LIKE "*" & [VendoPartNumber] & "*"

If you are resonably sure of some delimiters you could do something like this too:

... WHERE [YourFreeTextField] LIKE "*# " & [VendoPartNumber] & ",*"

.....

In addition, if you are resonably sure of the use of the octothorpes (#) you can use VBA's Split() function to extract the part numbers and put them in an array or return a "cleaner" CSV of the partnumbers, but Split() does not work in a Query (of, so you need to create a User Defined Function in a module... maybe something like this:

Public Function CleanPartNumberCSV(strYourFreeTextValue As String) As String
   
    Dim aPartNumber() As String
    Dim x As Long
   
    aPartNumber = Split(strYourFreeTextValue, "#")
   
    For x = LBount(aPartNumber) To UBound(aPartNumber)
       
        'Remove Hyphens and spaces
        aPartNumber(x) = Replace(aPartNumber(x), "-", "")
        aPartNumber(x) = Replace(aPartNumber(x), Chr(32), "")
       
         '<do any further massaging you want>
    Next x
   
    'Return a pipe delimited string with your best attempt of extracting partnumbers
    CleanPartNumberCSV = "|" & Join(aPartNumber, "|") & "|"
 
End Function
-------------

The reason for the format of "|partnumber|partnumber|" is so you can use the LIKE in a where clause to effectively filter out a SINGLE partnumber ...

.... WHERE CleanPartNumberCSV([YourFreeTextField] & "") Like "|" & ActualPartNumberBeingSought & "|"

{note the .. &"" when passing the value to CleanPartNumberCSV is to coerce Nulls to a ZLS, thus not erroring out the UDF}

----------------

Hope this helps you in your daunting task!!

 

by: davecocksPosted on 2009-10-31 at 22:23:39ID: 25712711

Hi,
I think datAdrenaline's idea's are spot on. I've had a crack at a UI in access for you. If you can get hold of a part list then the DB I've added may be of some use. I created a user defined function that would find part numbers in the free form text string.
The useful thing is that it returns multiple records i.e. if your string is 'hhhss645 jjjhh P/N22 hhj' and you had part numbers 645 and P/N22 then it returns 2 records and connects them to that string.

I've added a basic form that could be used as a UI to review these records and then choose the correct part number. If you could then combine this with datAdrenaline's CleanPartNumberCSV I think you would be well on your way to a solution.

The code to create a list of IDs to partIDs is located in the module.

 

by: ShadowITPosted on 2009-11-01 at 01:38:20ID: 25713121

Thanks everyone for your input...seems I have a lot to review.  I should also clarify that P/N and PN# were just examples of the variation I was contending with...it's not consistant.  Heck some of these records don't even contain part number.  Also, to the question why I thought SoundEx would be applicable...well perhaps not in its native form.  But take a look at the link below:

http://anastasiosyal.com/archive/2009/01/11/18.aspx

I am thinking that JaroWinkler may be modded to suit my needs...but this is above my skill set and I'd probably have to invoke outside assistance.  Again this would be a suggestion for a long terms solution to address this legacy data.  Thanks

 

by: earthman2Posted on 2009-11-01 at 02:38:41ID: 25713237

looks like you need to define a search phrase for a regular expression parser.

 

by: cactus_dataPosted on 2009-11-01 at 11:33:00ID: 25715037

Or outsource the task for manual, intelligent, systematic handling!

Amazon Mechanical Turk:

https://www.mturk.com/mturk/welcome
http://en.wikipedia.org/wiki/Amazon_Mechanical_Turk

/gustav

 

by: ShadowITPosted on 2009-11-17 at 09:23:28ID: 31648286

It was actually a combination of these suggestions that got me to my desired results.  Thanks All!

20120131-EE-VQP-002

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