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Where filter on file in SQL Left Outer join
Message
De
23/08/2005 05:45:16
Richard Candeland
Richard Candeland Software Services
Keighley, Royaume Uni
 
 
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Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Titre:
Where filter on file in SQL Left Outer join
Versions des environnements
Visual FoxPro:
VFP 8 SP1
OS:
Windows XP
Database:
Visual FoxPro
Divers
Thread ID:
01042840
Message ID:
01042840
Vues:
94
I have a 3 file query. For every record in file A, there is a record in file B, but only some records in files A/B have a record in file C.

In VFP 6 I had a query with a left outer join to file C and a where filter on file C:

select ....
from A join B on A.memb_no = B.memb_no ;
left outer join C on A.memb_no = C.memb_no ;
where C.lastpaid > dlDate

This produced the result I wanted: All records from file A where there was either no record in file C or there was a record in file C and field lastpaid had a date later than variable dlDate.

In VPF 8, the result is different. I lose all the records from file A where there is no record in file C.

I can see now that my SQL syntax was sort of ambiguous, but what should it be? Is it possible to get what I want in a single SQL statement?
Richard
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