Re: HITNO : Informacioni sistemi
Zna li neko?
Treba nam pomoc:
Date su relacije R(X,Y,Z) i S(U,V,W) pri cemu Z referise S
a upit je
UPDATE R SET Y=(Select COUNT (*)
FROM S
WHERE V=Z )
WHERE Z IN ( SELECT U
FROM S
WHERE W=2)
Koje indekse treba uvesti?
Hvala!
Pozdrav,
Zorica i Vlada
Treba nam pomoc:
Date su relacije R(X,Y,Z) i S(U,V,W) pri cemu Z referise S
a upit je
UPDATE R SET Y=(Select COUNT (*)
FROM S
WHERE V=Z )
WHERE Z IN ( SELECT U
FROM S
WHERE W=2)
Koje indekse treba uvesti?
Hvala!
Pozdrav,
Zorica i Vlada
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- HITNO : Informacioni sistemi
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