where Ri means the relation, Ii means the
integrity constraint for i [member of] <1,n>; I means global
integrity constraints for all relationships among relations.
Existence
integrity constraint: [Tau] ([E.sub.i]) cannot have null or duplicate values for [k.sub.i], for all i = 1, 2, ..., n.
This condition is imposed by the
integrity constraint in line 10, and relative to the facts in listing 1 it is instantiated to
A System Prototype for Map Editing and
Integrity Constraint Validation
However, contrary to the schema constraint routine, in the
integrity constraint routine the removal of a subtree (rooted at an update position p) triggers the subtree traversal for searching key and foreign key values involved in the update.
Note that the definition of local and global data items suggests that there be no
integrity constraints between local and global data items at a site (as that could lead to an intersite
integrity constraint involving local data items).
Partial subsumption is essentially the application of the subsumption algorithm with C as the
integrity constraint and D as the body of a rule that defines a predicate.
In addition to defining a database in terms of an EDB and an IDB, it is necessary to formalize what is meant by an
integrity constraint. Kowalski (1978) suggests that an
integrity constraint is a formula that is consistent with the DDB, but for Reiter (1984) and Lloyd and Topor (1985), an
integrity constraint is a theorem of the DDB.
Suppose the plane can carry at most 200 passengers, so that the
integrity constraint of the system is res_seats [less than or equal to] 200.
And faced with challenging PCB interposer layout due to irregular routing patterns and signal
integrity constraints, Intel engineers introduced a router using AI and ML at PCB West last year.