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Partial INTEGER search

 
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drammo
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Joined: 13 Jan 2006
Posts: 20
Topics: 10
PostPosted: Thu May 04, 2006 2:07 pm    Post subject: Partial INTEGER search Reply with quote
The requirement is to identify all rows based on the last four digits of a column defined as integer.

Code:

Source Table

Account_ID
----------
       105
     34221
   2223123
   3310105
   4421105
  55210105

If the last four digits to match are 0105, the output should be

Account_ID
----------
       105
   3310105
  55210105


I am thinking in the lines of:

1. Convert the column to fixed length string (9 char long), padded with leading zeros
2. Substring and match the value.

I need help achiving the first or a completely different solution giving the desired result set.

Performance is critical (millions of rows in table), should run on DB2V7

Thanks!
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kolusu
Site Admin
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Joined: 26 Nov 2002
Posts: 12378
Topics: 75
Location: San Jose
PostPosted: Thu May 04, 2006 2:22 pm    Post subject: Reply with quote
drammo,

Quite simple . You don't need char function or substring function. Simply divide the column by 10000 and check if the remainder is 0105

Code:

SELECT * 
  FROM TABLE
 WHERE MOD(ACCOUNT_ID,10000) = 0105


Hope this helps...

Cheers

Kolusu
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drammo
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Joined: 13 Jan 2006
Posts: 20
Topics: 10
PostPosted: Thu May 04, 2006 2:31 pm    Post subject: Reply with quote
I am a dumbo. Thanks Kolusu.
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drammo
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Joined: 13 Jan 2006
Posts: 20
Topics: 10
PostPosted: Thu May 04, 2006 2:34 pm    Post subject: Reply with quote
Out of curosity, is there a way to pad leading zeros to an integer column, while converting it to Char?

Thanks!
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kolusu
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Joined: 26 Nov 2002
Posts: 12378
Topics: 75
Location: San Jose
PostPosted: Thu May 04, 2006 2:37 pm    Post subject: Reply with quote
drammo,

Use the Scalar function DIGITS to pad leading zeroes.
Code:

SELECT DIGITS(ACCOUNT_ID)
  FROM TABLE
;


Check this link which explains in detail about DIGITS function

http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/DSNSQH11/3.2.27?SHELF=&DT=20010718164132&CASE=

Hope this helps...

Cheers

Kolusu
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