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A marker for a value that is missing or unknown. A null is not zero and not empty text. Comparing a value with a null gives an unknown result. To find nulls in SQL, use IS NULL.
Also called
Missing value
Example
If a discount field is null, the discount is unknown. Treating it as zero would understate the true discount.
For your role
Choose your role to see what this term means in your work.
Why it matters
Missing values can quietly distort averages and counts.
