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Get column from derived table
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Information générale
Forum:
Visual FoxPro
Catégorie:
Autre
Versions des environnements
Visual FoxPro:
VFP 9 SP2
OS:
Windows Server 2012
Network:
Windows 2008 Server
Database:
MS SQL Server
Application:
Web
Divers
Thread ID:
01601694
Message ID:
01601710
Vues:
25
>>>>>Does it make sense?
>>>>
>>>>You need a simple LEFT JOIN, e.g.
>>>>select Cust.ID, Cust.Name, T.Descr as TypeDescr
>>>>from Customer cust LEFT JOIN Types T ON Cust.Type_ID = T.Descr
>>>
>>>I tried it. LEFT JOIN creates a query where you have as many records for each record in CUSTOMER as there are TYPEs. Didn't work for me.
>>
>>Something doesn't make sense here.
>>
>>If type_ID in the Customer table is an FK and Type_ID in the Types table is primary key, then LEFT JOIN should only bring one row per customer with the type description.
>>
>>May be Type_ID is not the primary key in the Types table?
>
>Correct. See my reply to Rob.

I saw the reply. So, which one of the descriptions per "type_id" do you want? Why do you allow duplicates in that lookup table? Sounds like a bad design.
If it's not broken, fix it until it is.


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