SQL & Enterprise Databases

Beginner/Filtering, Sorting & Operators

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Curriculum Lesson Objective

Handling Missing Data (IS NULL, IS NOT NULL)

NULL represents missing, unknown, or inapplicable data; it cannot be evaluated with standard comparison operators like = or !=. Key Sub-topics: • Sub-topic 1: Why column = NULL evaluates to UNKNOWN instead of TRUE and why IS NULL is mandatory • Sub-topic 2: NULL propagation through arithmetic operations and string concatenation

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Sorting Data (ORDER BY ASC/DESC) & Limiting Results (TOP, LIMIT, OFFSET-FETCH)

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