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I know you said that this was Informix, but I'll post the article below anyway for the benefit of other listers.
Oracle Technology Network > Oracle Magazine > September/October 2002
Turning On Pivot Tables By Jonathan Gennick
http://otn.oracle.com/oramag/oracle/02-sep/o52sql.html
Describes a method for Oracle 9i where you don't have to worry that the table you are using to generate sequential numbers does not have enough rows for your query.
> -----Original Message-----
> From: ml-errors_at_fatcity.com [mailto:ml-errors_at_fatcity.com]On Behalf Of
> Kirtikumar Deshpande
>
> I need some SQL help.
> Not sure if this is possible in plain SQL or not, but here it is:
> I have a table with two columns:
> EMPNBR LINENBR
> ------ -------
> 100 1
> 200 4
> 300 8
> 400 9
> 500 14
>
> How would I find out the missing linenbrs (2,3,5,6,7) if I
> was given minlinenbr as 1 and
> maxlinenbr as 10 that would be passed as variables (using &).
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