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What is the meaning of Null Values in Systematic Treatment of Null Values in the 12 Codd's Rules?

5. What is the meaning of Null Values in Systematic Treatment of Null Values in the 12 Codd's Rules?

1. No value in cell
2. Inappropriate Information
3. Unknown data
4. All of the above

Answer: D) All of the above

Explanation:

Null Values in Systematic Treatment of Null Values in the 12 Codd's Rules has different meanings such as no value in the cell, missing the data, inappropriate information, the primary key should not be null and unknown data.