A candidate key, or simply a key, of a relational database is any set of columns that have a unique combination of values in each row, with the additional...

needed] of a candidate key (a minimal superkey); any other candidate key is an alternate key. In relational database terms, a primary key does not differ...

attributes must also be a candidate key in S. In other words, a foreign key is a set of attributes that references a candidate key. For example, a table called...

In relational database management systems, a unique key is a candidate key. All the candidate keys of a relation can uniquely identify the records of the...

In database design, a composite key is a candidate key that consists of two or more attributes, (table columns) that together uniquely identify an entity...

Look up key or Keys in Wiktionary, the free dictionary. Key, Keys, The Key or The Keys may refer to: Key (cryptography), a piece of information needed...

non-candidate-key attribute must depend on the whole candidate key, not just part of it. To normalize this table, make {Title} a (simple) candidate key (the...

A candidate, or nominee, is a prospective recipient of an award or honor, or a person seeking or being considered for some kind of position. For example...

special cases of constraints are expressed as keys and foreign keys: A candidate key, or simply a key, is the smallest subset of attributes guaranteed...

non-prime attributes depend only on the candidate keys and do not have a transitive dependency on another key. A hypothetical example of a failure to...

S2, S3 and S4 are candidate keys (that is, minimal superkeys for that relation) because e.g. S1 ⊂ S5, so S5 cannot be a candidate key. Given that 2NF prohibits...

attribute that is functionally dependent on any proper subset of any candidate key of the relation (i.e. it lacks partial dependencies). A non-prime attribute...

set of all attributes is always uniquely valued for every tuple. A candidate key (or minimal superkey) is a superkey that can't be reduced to a simpler...

designers use surrogate keys systematically regardless of the suitability of other candidate keys, while others will use a key already present in the data...

irreducible. A join dependency *{A, B, … Z} on R is implied by the candidate key(s) of R if and only if each of A, B, …, Z is a superkey for R. The fifth...

A perennial candidate is a political candidate who frequently runs for elected office and rarely, if ever, wins. Perennial candidates are most common...

candidate. Key stretching also improves security in some real-world applications where the key length has been constrained, by mimicking a longer key...

{\displaystyle \twoheadrightarrow } Y, X is a superkey—that is, X is either a candidate key or a superset thereof. If the column headings in a relational database...

foreign key can only contain either null values or values from a parent table's primary key or a candidate key. In other words, when a foreign key value...

juxtapositions in database theory.) An important notion in this context is a candidate key, defined as a minimal set of attributes that functionally determine...

possibly the correct key. This potentially-correct key is called a candidate key. The attacker can determine which candidate key is correct by testing...

an anti-war independent candidate for in Sedgefield, a constituency represented by the then Prime Minister Tony Blair. Keys is a founder member of the...

presence of unicity constraints on some columns (which turns it into a candidate key). SQL allows the selection of rows from a relational table: this operation...

Union and Local 412 Disqualified candidate $462,916 of this total was self-funded by Harper Withdrawn candidate Key: A – all adults RV – registered voters...

keys being added. Some of the keys are objective, such as economic growth, while some are subjective, such as candidate charisma. The system consists...

refer to: Complementary code keying, a modulation technique used in IEEE 802.11b Composite candidate key, a candidate key comprising more than one field...

Alan Lee Keyes (born August 7, 1950) is an American politician, political scientist, and perennial candidate who served as the Assistant Secretary of...

notes. Part 3 has a longer conversation than those in Part 1. Candidates listen for key information in the conversation and answer five multiple-choice...

27, 2012). "Romney's Jewish Connector How Dan Senor became the GOP candidate's key emissary to Israel's intelligentsia and the Washington policy scene"...

write-in candidate is a candidate whose name does not appear on the ballot but seeks election by asking voters to cast a vote for the candidate by physically...