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identifying gap in 'sequence' in column ?

 
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tcurrier
Intermediate


Joined: 10 Feb 2006
Posts: 188
Topics: 68
PostPosted: Tue Mar 30, 2010 6:53 am    Post subject: identifying gap in 'sequence' in column ? Reply with quote
I have a table with 2 columns... POLNO is the 'key' column. Would there
be a way to identify the POLNOs where there is a 'gap' in the sequencing
of ITEMNOs ?... e.g., could I identify POLNO BBB in the example below as having a 'gap' ? (maximum value of ITEMNO is 6 if that makes a difference)

Thanks for any help.

Code:
POLNO      ITEMNO

AAA              1
AAA              2
AAA              3

BBB              1
BBB              2
BBB              4

CCC              1
CCC              2
CCC              3
CCC              4
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Dibakar
Advanced


Joined: 02 Dec 2002
Posts: 699
Topics: 63
Location: USA
PostPosted: Tue Mar 30, 2010 10:36 am    Post subject: Reply with quote
Didn't test it but this is my thought -

Code:
SELECT POLNO
  FROM TABLENAME
  GROUP BY POLNO
  HAVING COUNT(*) < (MAX(ITEMNO) - MIN(ITEMNO) + 1)
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