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What is the Distinction between condition defined and user defined constraints which of these constraints can system check?
Harshni88
In a generalization-specialization hierarchy, it must be possible to decide
which entities are members of which lower level entity sets. In a conditiondefined
design constraint, membership in the lower level entity-sets is evaluated
on the basis of whether or not an entity satisfies an explicit condition or
predicate.User-defined lower-level entity sets are not constrained by a membership
condition; rather, entities are assigned to a given entity set by the database
user.
Condition-defined constraints alone can be automatically handled by the system.
Whenever any tuple is inserted into the database, its membership in the
various lower level entity-sets can be automatically decided by evaluating the
respective membership predicates. Similarly when a tuple is updated, its membership
in the various entity sets can be re-evaluated automatically
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∙ 12y ago
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