Question

Define Composite key & primary key , secondry key
explain ​

Answer 1

A key which has multiple attributes to uniquely identify rows in a table is called a composite key. An artificial key which aims to uniquely identify each record is called a surrogate key. Primary Key never accept null values while a foreign key may accept multiple null values.

Answer 2

Answer:

A key which has multiple attributes to uniquely identify rows in a table is called a composite key. An artificial key which aims to uniquely identify each record is called a surrogate key. Primary Key never accept null values while a foreign key may accept multiple null values.

Explanation:

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