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InterviewSolution
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A table though cannot have more than one primary key howevercombination of more than one fieldcan serve as a primary key, a primarykey is so designed is known as*Composite primary key*Complex primary key |
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Answer» Primary keys MUST CONTAIN unique VALUES. A primary key column cannot have NULL values. A table can have only ONE primary key, which may consist of single or multiple fields. When multiple fields are USED as a primary key, they are called a composite key. |
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