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R. Si and ?. , S traitée : = S traitée ? {R i } 3. Si R i ? S aut alors 4. Pour tout assertion a ? A / a.lhs.rel = R i ou a.rhs.rel = R i 5. Si a.lhs.rel = R i alors 6

T. Si, . Et-t-j-appartiennent-À-la-même-source-4, and J. :. Alors, B} // Création d'une opération de jointure entre T i et T j sur le critère de jointure T i

X. Si and . Xcourant-alors-2, S traitée : = S traitée ? {c.lhs.rel,c.rhs.rel} 3

S. J. Rhs, rel ? S traitée alors 7. Xcourant := Xcourant ? X j 8. RechercheChemin (XCourant, X, ChemCourant??j) 9. FinSi 10

X. Si and . Xcourant-alors-2, S traitée : = S traitée ? {c.lhs.rel,c.rhs.rel} 3

S. J. Rhs, rel ? S traitée alors 7. RechercheDF 8

S. J. Lhs, rel ? S traitée alors 14. RechercheDF 15, p.17