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How to use JOIN and SELECT IN correctly?
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Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Versions des environnements
Visual FoxPro:
VFP 9 SP1
Divers
Thread ID:
01332522
Message ID:
01332564
Vues:
6
>The JOIN is a part of FROM clause.
>
>SELECT * FROM mytable1
>JOIN mytable3 ON mytable3.field2 = mytable1.field2
>WHERE field1 in ( select field1 FROM mytable2 )
>
>Also JOIN is usualy faster in VFP than IN
>
>SELECT mytable3 .* FROM mytable1
>JOIN mytable3 ON mytable3.field2 = mytable1.field2
>JOIN mytable2 ON mytable1.field1 = mytable2.field1
>
>>

Thank you, Sergey.
"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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