Primary key

Primary key

In relational databases, an attribute in an entity that uniquely identifies rows of that entity. For example, the Employee entity can contain an empID attribute that uniquely identifies each employee.

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Industry/Domain: Software; Computer
Category: Operating systems
Company: Apple
Product: Mac OS X
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Industry/Domain: Aerospace Category: Space flight

Kepler-22b

The Kepler space observatory found at 600 light years from Earth the first planet in the 'habitable zone'. The planet, Kepler-22b, is the smallest one ...