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Sql Select with multiple joins
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Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
01648784
Message ID:
01648794
Vues:
25
>>>>>Try
>>>>>
>>>>>select Eq.Equip_Id, Eq.Equip_Desc, Tr.*
>>>>>
>>>>>from Equipment Eq INNER JOIN TransDetail Tr on Eq.Equp_Pk = Tr.Equp_Pk
>>>>>UNION -- this will make result distinct
>>>>>select Eq.Equip_Id, Eq.Equip_Desc, Tr.*
>>>>>from TransDetail Tr INNER JOIN Orders Or on Tr.Order_No = Or.Order_No
>>>>>inner join Equipment Eq ON Or.Orders_Equip_ID = Eq.Equip_ID
>>>>
>>>>Thank you. Please see my reply Thomas if the SQL Select I have created also makes sense.
>>>
>>>I think the UNION version is clearer and easier to understand. It is also more likely to perform better.
>>
>>Ok. We agree to disagree :).
>
>The simple way for you would be to test both versions and find out which one performs better.

Maybe. If I have time.
"The creative process is nothing but a series of crises." Isaac Bashevis Singer
"My experience is that as soon as people are old enough to know better, they don't know anything at all." Oscar Wilde
"If a nation values anything more than freedom, it will lose its freedom; and the irony of it is that if it is comfort or money that it values more, it will lose that too." W.Somerset Maugham
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