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Saturday, November 3, 2018
Definition of Primary Key in DBMS / From 124study.blogspot.com
November 03, 2018
BCA-3rd Sem
,
Question Answer
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A
primary key
is a special relational database table column (or combination of columns) designated to uniquely identify all table records. A
primary key's
main features are: It must contain a unique value for each row of data. It cannot contain null value
s.
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