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What is Understanding Null Values in SQL about?

Null values in databases represent unknown or missing data. SQL uses the NULL keyword to indicate null values, which are treated differently than regular values in queries and calculations. Null values can cause expressions to evaluate to null and affect results. Functions like COALESCE and comparisons like IS NULL help work with null values in SELECT statements. Boolean expressions with null values may evaluate to true, false or null depending on the operator.

Author

irenafemic

Language

EN