Question-23: You are designing a table with the 5 columns (A, B, C, D,E) and you defined key as below

PRIMARY KEY (A, B, C)

Which of the following statement is true?

1. Columns A, B are partition key
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Ans: B, C

Exp: Let’s see few basic concepts regarding primary, Partition and clustering key concept.

• To identify a row uniquely we need to use primary key.
• If primary key is made of more than one column than it is known as a composite key

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