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What to use instead of _tally for SUM() SQL Select?
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À
29/11/2005 08:54:13
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Versions des environnements
Visual FoxPro:
VFP 9
Divers
Thread ID:
01072776
Message ID:
01072787
Vues:
16
>>The variable _tally indicates if SQL Select found any records. However, if the SQL Select has SUM() function _tally returns value of 1, even though there were no records matching WHERE.
>>
>>What do you recommend to use, instead of _tally, to check if SQL Select found records?
>>
>>Thank you.
>
>Add one column, count(1) as nTally.

I will think about this, although, this may slow the query (maybe not significantly though). I found a solution, I think. The resulting value of SUM() function has NULL if no records match the WHERE clause.

Thank you.
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