4. Why do we use Is Null criteria in a query?

1.	4. Why do we use Is Null criteria in a query?
Answer» Answer: A database uses a special VALUE for these holes: NULL. ... We do this by using the FILTER "is null" in the criteria row of our QUERY. We use "is null" and not simply "null", like we WOULD for any other filter, because for many database SYSTEMS, NULL is a special value that isn't comparable to anything else.

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Answer:

database uses a special VALUE for these holes: NULL. ... We do this by using the FILTER "is null" in the criteria row of our QUERY. We use "is null" and not simply "null", like we WOULD for any other filter, because for many database SYSTEMS, NULL is a special value that isn't comparable to anything else.

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4. Why do we use Is Null criteria in a query?​

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4. Why do we use Is Null criteria in a query?