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SQL and duplicates
Message
De
07/08/2000 16:35:19
 
 
À
07/08/2000 16:28:46
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
00401910
Message ID:
00401925
Vues:
19
>>
SELECT field1, COUNT(*) as matchrecs FROM <i>blah</i> GROUP BY field1 HAVING matchrecs > 1 INTO CURSOR <i>foo</i>
>>
>>SELECT * FROM <i>blah</i> WHERE field1 IN (SELECT field1 FROM <i>foo</i>) INTO CURSOR Dups
>
>Ed: Is there an advantage to doing this in two steps rather than one statement such as
>
>SELECT * FROM table WHERE field1 IN (SELECT field1 FROM table GROUP BY field1 HAVING COUNT(*) > 1)
>

It's easier to understand, and doesn't rely on the property COUNT(*) being published, since HAVING acts after the GROUP BY action occurs, and isn't explicitly carried forward in the sub-select.

>Thanks...........Rich
EMail: EdR@edrauh.com
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