integrity constraint

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• Constraint — is an element factor or a subsystem that works as a bottleneck. It restricts an entity, project, or system (such as a manufacturing or decision making process) from achieving its potential (or higher level of output) with reference to its goal.… …   Wikipedia

• Referential integrity — in a relational database is consistency between coupled tables. Referential integrity is usually enforced by the combination of a primary key or candidate key (alternate key) and a foreign key. For referential integrity to hold, any field in a… …   Wikipedia

• Check Constraint — A check constraint (also known as table check constraint) is a condition that defines valid data when adding or updating an entry in a table of a relational database. A check constraint is applied to each row in the table. The constraint must be… …   Wikipedia

• Declarative Referential Integrity — (DRI) is one of the techniques in the SQL database programming language to ensure data integrity. Contents 1 Meaning in SQL 2 Product specific meaning 3 References 4 …   Wikipedia

• Propagation constraint — In database systems, a propagation constraint details what should happen to a related table when we update a row or rows of a target table (Paul Beynon Davies, 2004, p.108). Tables are linked using primary key to foreign key relationships. It is… …   Wikipedia

• Abductive logic programming — is a high level knowledge representation framework that can be used to solve problems declaratively based on abductive reasoning. It extends normal Logic Programming by allowing some predicates to be incompletely defined, declared as abducible… …   Wikipedia

• Design closure — is the process by which a VLSI design is modified from its initial description to meet a growing list of design constraints and objectives. Every step in the IC design (such as static timing analysis, placement, routing, and so on) is already… …   Wikipedia

• Virtuoso Universal Server — Virtuoso Conductor (Database Administration User Interface) Developer(s) OpenLink Software …   Wikipedia

• Relational model — The relational model for database management is a database model based on first order predicate logic, first formulated and proposed in 1969 by Edgar Codd. [ Derivability, Redundancy, and Consistency of Relations Stored in Large Data Banks , E.F …   Wikipedia

• ACID — For other uses, see Acid (disambiguation). In computer science, ACID (atomicity, consistency, isolation, durability) is a set of properties that guarantee database transactions are processed reliably. In the context of databases, a single logical …   Wikipedia

• Codd's 12 rules — Codd s twelve rules are a set of thirteen rules (numbered zero to twelve) proposed by Edgar F. Codd, a pioneer of the relational model for databases, designed to define what is required from a database management system in order for it to be… …   Wikipedia