Search results
Results From The WOW.Com Content Network
A foreign key is a set of attributes in a table that refers to the primary key of another table, linking these two tables. In the context of relational databases, a foreign key is subject to an inclusion dependency constraint that the tuples consisting of the foreign key attributes in one relation, R, must also exist in some other (not necessarily distinct) relation, S; furthermore that those ...
Weak entity. In a relational database, a weak entity is an entity that cannot be uniquely identified by its attributes alone; therefore, it must use a foreign key in conjunction with its attributes to create a primary key. The foreign key is typically a primary key of an entity it is related to. The foreign key is an attribute of the ...
Diplomatic rank is a system of professional and social rank used in the world of diplomacy and international relations.A diplomat's rank determines many ceremonial details, such as the order of precedence at official processions, table seatings at state dinners, the person to whom diplomatic credentials should be presented, and the title by which the diplomat should be addressed.
Surrogate key. A surrogate key (or synthetic key, pseudokey, entity identifier, factless key, or technical key[citation needed]) in a database is a unique identifier for either an entity in the modeled world or an object in the database. The surrogate key is not derived from application data, unlike a natural (or business) key.
The Military Order of the World Wars was formed in 1919 at the suggestion of General of the Armies John J. Pershing as a fraternity for American military officers coming out of the Great War. Two decades later, when the USA became involved in WWII the organization name was pluralized to its current title of Military Order of the World Wars.
Definition: Referential integrity is a database concept that ensures that relationships between tables remain consistent. When one table has a foreign key to another table, the concept of referential integrity states that you may not add a record to the table that contains the foreign key unless there is a corresponding record in the linked table.
The Special Air Service was a unit of the British Army during the Second World War that was formed in July 1941 by David Stirling and originally called "L" Detachment, Special Air Service Brigade – the "L" designation and Air Service name being a tie-in to a British disinformation campaign, trying to deceive the Axis into thinking there was a ...
The wear of foreign decorations may either be approved on a case-by-case basis or a general order may be declared allowing for blanket approval to all U.S. service members to wear a particular non-U.S. decoration. The following is a list of foreign decorations which have been approved at one time for wear on United States military uniforms.