Alan Freedman -- The Computer Language Company - Computer Desktop Encyclopedia
Computer Desktop Encyclopedia
Longest-Running Tech Reference on the Planet

A CDE Definition

You'll love The Computer Desktop Encyclopedia (CDE) for Tech Term of the Day (TTOD)

LOOK UP ANOTHER TERM


primary key

The column (field) in a relational database that uniquely identifies the row in the table. For example, account number is often a primary key. A "composite primary key" or "super key" is made up of two or more columns such as account number + name. See candidate key.



candidate key

One or more columns (fields) in a relational database that can uniquely identify a row in the table. If there are two or more candidate keys, only one is selected as the "primary." See primary key.



Personal Use Only

Before/After Your Search Term
BeforeAfter
previewprimary memory
preview dialerprimary partition
Preview DNSPrimary Rate
preview modeprimary storage
PRIprime
PRI/T1prime number
priceline.comPrimestar
primary cacheprimitive
Primary Domain Controllerprimitive data type
primary indexPrince

Terms By Topic
Click any of the following categories for a list of fundamental terms.
Computer Words You Gotta KnowSystem design
Job categoriesUnix/Linux
Interesting stuffPersonal computers
InternetIndustrial Automation/Process Control
Communications & networkingAssociations/Standards organizations
HistoryDesktop publishing
Audio/VideoGraphics
MainframesSecurity
ProgrammingHealthcare IT
System design