Unique key — In relational database design, a unique key can uniquely identify each row in a table, and is closely related to the Superkey concept. A unique key comprises a single column or a set of columns. No two distinct rows in a table can have the same… … Wikipedia
Constraint — Mit Constraints (deutsch „Zwangsbedingungen“) werden in diversen Programmiersprachen Bedingungen definiert, die zwingend vom Wert einer Variablen erfüllt werden müssen, damit der Wert ins System übernommen werden kann. In Datenbanksystemen finden … Deutsch Wikipedia
Unique games conjecture — The Unique Games Conjecture (UGC) is a conjecture in computational complexity theory made by Subhash Khot in 2002.A unique game is a special case of a two prover, one round (2P1R) game. A two player, one round game has two players (also known as… … Wikipedia
Constraint logic programming — Programming paradigms Agent oriented Automata based Component based Flow based Pipelined Concatenative Concurrent computing … Wikipedia
Constraint satisfaction — In artificial intelligence and operations research, constraint satisfaction is the process of finding a solution to a set of constraints that impose conditions that the variables must satisfy. A solution is therefore a vector of variables that… … Wikipedia
Unique Particle Attribution — The Unique Particle Attribution (UPA) rule is XML Schema s mechanism to prevent schema ambiguity.Due to the UPA rule the schema fragment given below is prohibited. Given the instance fragment: 42It is not possible to create a Post Schema… … Wikipedia
Complexity of constraint satisfaction — The complexity of constraint satisfaction is the application of computational complexity theory on constraint satisfaction. It has mainly been studied for discriminating between tractable and intractable classes of constraint satisfaction… … Wikipedia
First class constraint — In Hamiltonian mechanics, consider a symplectic manifold M with a smooth Hamiltonian over it (for field theories, M would be infinite dimensional). Poisson bracketsSuppose we have some constraints : f i(x)=0, for n smooth functions :{ f i } {i=… … Wikipedia
Null (SQL) — The Greek lowercase omega (ω) character is used to represent Null in database theory. Null is a special marker used in Structured Query Language (SQL) to indicate that a data value does not exist in the database. Introduced by the creator of the… … Wikipedia
Ingres (database) — Ingres Ingres Corporation logo Developer(s) Actian Corporation Stable release Ingres Database 10 / October 12, 2010; 13 months ago (2010 10 12) … Wikipedia
David Ricardo — Classical economics Born 19 April 1772(1772 04 19) Died … Wikipedia