integrity constraints การใช้

• The abducible predicates can be constrained by integrity constraints, which can have the form:
• The DBMS must reject a integrity constraint.
• Which method is used may be determined by a referential integrity constraint defined in a data dictionary.
• Used in this way, business rules are like SQL queries, rather than data integrity constraints.
• The potential solution of becoming a citizen by residence and naturalization fails because it violates the integrity constraint.
• However, only the second potential explanation, " the sprinkler was on ", satisfies the integrity constraint.
• An "'XML schema "'is a description of a type of uniqueness and referential integrity constraints.
• "Foreign keys " are integrity constraints enforcing that the operation that draws on information from several relations at once.
• Normalization involves arranging attributes in tables based on dependencies between attributes, ensuring that the dependencies are properly enforced by database integrity constraints.
• With Fariba Sadri, he developed an agent model in which beliefs are represented by logic programs and goals are represented by integrity constraints.
• Whether the database design used the integrity constraint based keys of the LDDT model as database access keys or indexes was an entirely separate decision.
• Kowalski was one of the early developers of Abductive Logic Programming, in which logic programs are augmented with integrity constraints and with undefined, abducible predicates.
• As argued by Christopher J . Date, business rules translate into data integrity constraints when one thinks in terms of the relational model of database management.
• The abducible predicates in A are " it rained " and " the sprinkler was on " and the only integrity constraint in \ mathit { IC } is:
• Quality criteria to prefer one solution over another, often expressed via integrity constraints, can be applied to select specific abductive explanations of the problem " G ".
• The primary keys and unambiguously role-named foreign keys expressed sometimes subtle uniqueness and referential integrity constraints that needed to be known and honored by whatever type of database was ultimately designed.
• Even current relational databases " do not allow referential integrity constraints to span databases . " There are few systems that maintain both ACID transactions and X / Open XA standards for distributed transaction processing.
• Computation in ALP combines the backwards reasoning of normal logic programming ( to reduce problems to sub-problems ) with a kind of integrity checking to show that the abductive explanations satisfy the integrity constraints.
• Because these constraints are generally only verified when a row is directly updated ( for performance reasons, ) and often implemented as implied INSERT or UPDATE triggers, integrity constraints could be violated by indirect action were it not for these limitations.
• If a referential integrity constraint is defined to the effect that { Shop Type, Nearest Shop } from the first table must refer to a { Shop Type, Shop } from the second table, then the data anomalies described previously are prevented.