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Joining tables
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À
15/11/2001 11:15:22
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Titre:
Divers
Thread ID:
00582131
Message ID:
00582140
Vues:
25
Is there any reason you're using outer join?

>I have the typical master, crossref, child set up. I'm trying to retrieve a particular child record, and having trouble.
>
>My master record links to 4 crossref records, which each link to 1 child record. I need to pull the child record with the location field of "MAIN"
>
>select master.*, child.altid as myfield ;
>from master ;
>left outer join crossref on master.id = crossref.id ;
>left outer join child on crossref.id2 = child.id2 and child.location = 'MAIN' ;
>where master.id = '1'
>
>
>
>The problem is that this creates 4 records in the result set -- and I only expect 1. I've simplified the problem a bit -- I have a feeling that there is a nuance of SQL syntax I'm missing. This select is going to end up in a veiw that I am using for reporting. If all else fails, I'll make seperate views and link em together with set relation -- I know that works ;-)
--sb--
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