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Questions and Answers
In SQL, how is NULL typically interpreted?
In SQL, how is NULL typically interpreted?
When is NULL used in the context of a database?
When is NULL used in the context of a database?
What does NULL represent when a person's home phone is withheld from listing?
What does NULL represent when a person's home phone is withheld from listing?
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?
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?
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Which of the following is NOT a typical interpretation of NULL in SQL?
Which of the following is NOT a typical interpretation of NULL in SQL?
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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.
