A Primary Key Whose Value Is Unique Across All Relations

question 46

Multiple Choice

A primary key whose value is unique across all relations is called a(n) :

• A) global primary key.
• B) inter-table primary key.
• C) enterprise key.
• D) foreign global key.

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Definitions:

Alkenes

Hydrocarbons that contain at least one carbon-carbon double bond, part of the unsaturated compounds class, which are involved in a variety of chemical reactions.

4-Ethylhept-1-Ene

A hydrocarbon molecule, which is an example of an alkene with a seven-carbon chain and an ethyl group at the fourth carbon.

Alkene

A hydrocarbon containing at least one carbon-carbon double bond, characterized by the prefix 'ene'.

E or Z Label

Descriptors used to specify the configuration of double bond substituents in geometric isomers, based on the Cahn-Ingold-Prelog priority rules.