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Which of the following statement is TRUE about Primary Key?

4. Which of the following statement is TRUE about Primary Key?

1. Table integrity is not enforced by the primary key.
2. The data in a primary key is always multiple.
3. 900 bytes is the maximum length of a primary key.
4. Null values are allowed in primary keys.

Answer: C) 900 bytes is the maximum length of a primary key

Explanation:

we can have up to 16 columns as primary key column and the total size of the key columns should be less than or equal to 900 bytes.