A NULL value in a database column signifies that the value is unknown, but it does not count as an empty value true or false
Understand the Problem
The question is asking for a true or false evaluation regarding the definition of a NULL value in a database context. It is looking for clarification on whether a NULL value is different from an empty value.
Answer
True
The statement is true
Answer for screen readers
The statement is true
More Information
A NULL value in a database signifies an absence of data or an unknown value, distinct from an empty value. It is crucial for database operations to properly handle such distinctions to avoid data integrity issues.
Tips
A common mistake is confusing a NULL value with zero or an empty string. Remember, NULL means the value is unknown or missing, whereas an empty string is a deliberate entry of a zero-length string.
Sources
- Understanding NULL Values in SQL - Enki - enki.com
- What is the definition of a NULL value in a database table - Quora - quora.com
- Working with SQL NULL values - SQLShack - sqlshack.com
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