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Sql counting duplicates, possible
Message
De
08/06/2015 13:22:20
Walter Meester
HoogkarspelPays-Bas
 
Information générale
Forum:
Visual FoxPro
Catégorie:
Codage, syntaxe et commandes
Versions des environnements
Visual FoxPro:
VFP 9 SP2
OS:
Windows 7
Network:
Windows 2008 Server
Database:
MS SQL Server
Application:
Desktop
Divers
Thread ID:
01620702
Message ID:
01620721
Vues:
48
>>>Hi, Is is possible to use an sql statement(s) to count and number duplicates? The original table looks something like this, showing an excerpt where there are three entries for one date:
>>
>>
>>SELECT * 
>>    FROM ch5 
>>    WHERE mdate IN (
>>        SELECT mdate FROM ch5 ;
>>        GROUP BY mdate ;
>>        HAVING COUNT(mdate) > 1)
>>
>>
>>>
>>>Mdate            Vs
>>>05/28/2013     v1
>>>05/28/2013     v1
>>>05/28/2013     v1
>>>
>>>
>>>The following is a start in that it will give me a table that shows how many duplicates exist for each date.
>>>
>>>
>>>SELECT mdate,COUNT(mdate) FROM ch5 ;
>>>    INTO TABLE dups;
>>>    GROUP BY mdate ;
>>>    HAVING COUNT(mdate) > 1
>>>
>>>
>>>Here is a part of the report that the above produces:
>>>
>>>
>>>mdate         cnt_mdate
>>>05/28/2013   3
>>>08/28/2013   2
>>>
>>>
>>>And by using set relationship and a do while loop, I can count and label the duplicates. But I was just wondering if an SQL statement(s) could do it all? The final output that I need is::
>>>
>>>
>>>Mdate            cnt/date    Vs
>>>05/28/2013     1              v1
>>>05/28/2013     2
>>>05/28/2013     3
>>>
>>>
>>>Thanks,
>>>Steve
>
>Thank you, I tried your code:
>
>
>SELECT * 	;
>    FROM ch5	;
>    WHERE mdate IN (	;
>        SELECT mdate FROM ch5 ;
>        GROUP BY mdate ;
>        HAVING COUNT(mdate) > 1)
>
>
>but I get an error: file ch5.dbf does not exist

Why would it? ch5 is a table isn't it? You used it in your example. Sorry, but this is the way to do it. You must have done something else wrong.

Walter,
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