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SQL quiz. Statement that returns *missing* values
Message
From
15/07/2011 12:49:56
 
General information
Forum:
Visual FoxPro
Category:
Coding, syntax & commands
Environment versions
Visual FoxPro:
VFP 9 SP1
Miscellaneous
Thread ID:
01518034
Message ID:
01518261
Views:
42
Thanks again,

Alex

>In case you're interested in solving this problem in SQL Server, this is a cool solution
>http://thefirstsql.com/2011/07/08/how-to-find-gaps-in-identity-columns-at-the-speed-of-light/
>
>>>A table has an index column that starts at one and goes to N, with some missing values. Is there an SQL Select statement (its ok to use more than one) that will return the first x items that are NOT present in the column?
>>>
>>>TIA,
>>>
>>>Alex
>>
>>Create a Numbers table (see, for example):
>>http://blogs.lessthandot.com/index.php/DataMgmt/DataDesign/passing-multiple-ranges-to-stored-proced
>>
>>Once you have the Numbers table:
>>
>>select top (N) N.Number from myTable T RIGHT JOIN Numbers N on T.IndexCol = N.Number
>>WHERE T.IndexCol IS NULL
>>ORDER BY N.Number
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