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V6s5 - SQL for Parent and only the Latest Child rec
Message
De
29/03/2004 05:02:07
Cetin Basoz
Engineerica Inc.
Izmir, Turquie
 
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
00888750
Message ID:
00890363
Vues:
22
>Hi Cetin
>
>>You don't need to group by but be careful this is not the same with the one we suggested.
>>
>>
SELECT tNonCummu.*, sNonCummu.*
>>    FROM tNonCummu
>>       JOIN sNonCummu ON tNonCummu.iID = sNonCummu.iPID
>>    WHERE sNonCummu.dDueDt =
>>       (SELECT MAX(sNC.dDueDt)
>>          FROM sNonCummu sNC where sNonCummu.iPID = sNC.iPID )
Cetin
>
>The original returned only one record between all parent so I added the GROUP BY, thus getting one for each parent, did I mess up somewhere? I'll try them both again.

In pseudocode it's like :

Select distinct values
while selecting
select the record with the latest date and populate related fields from that record

>> WHERE sNonCummu.dDueDt =
>> (SELECT MAX(sNC.dDueDt)
>> FROM sNonCummu sNC where sNonCummu.iPID = sNC.iPID )

Tells to find latest date for 'current of' iPID.
= works as subquery returns a single value.

Cetin
Çetin Basöz

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