A) Numeric
B) object
C) Related
D) unique
E) None of these
Correct Answer: D
Solution :
The primary key of a relational table uniquely identifies each record or row in the table. For a table, it enables each record to be unique without ambiguity. That it, it doesn't allow duplicates, eg. In a table CUSTOMERS, it is difficult to differentiate each on his name. Since homonyms May exist. Therefore it creates field code-client where each code is unique in designating It as primary key to ensure that. Every client is different.
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