SQL NULL Values and Three-Valued Logic Quiz

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Questions and Answers

In SQL, how is NULL typically interpreted?

Unknown Value (correct)
Empty Value
Zero Value
Infinite Value

When is NULL used in the context of a database?

When a person's home phone is withheld from listing
When a person's date of birth is not known (correct)
When a person's address is not applicable
When a person does not have a home phone

What does NULL represent when a person's home phone is withheld from listing?

Unavailable or withheld value (correct)
Not applicable attribute
Unknown value
Empty value

How is a person's home phone represented in the database if it is not known whether or not the person has a home phone?

<p>NULL (D)</p> Signup and view all the answers

Which of the following is NOT a typical interpretation of NULL in SQL?

<p>Zero Value (A)</p> Signup and view all the answers

Study Notes

NULL in SQL

NULL is typically interpreted as a missing or unknown value in SQL.
NULL is used in a database to represent a value that is not available, not applicable, or not known.
In the context of a person's home phone being withheld from listing, NULL represents the absence of a phone number.
If a person's home phone is not known, it is typically represented as NULL in the database, indicating that the value is unknown.
A typical interpretation of NULL in SQL is NOT that it represents a zero or a blank space; rather, it specifically represents a missing or unknown value.

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Description

Test your understanding of NULL values and three-valued logic in SQL with this quiz. Explore comparisons involving NULL and enhance your knowledge of handling NULL values in database queries.