Advanced Filtering

Advanced NOT & Negation Logic: Real-World

Negation finds missing data: customers without orders, products not in any category, users who haven't logged in, records not matching patterns. Data Quality Ch

Negation finds missing data: customers without orders, products not in any category, users who haven't logged in, records not matching patterns.

Data Quality Checks

Find orphaned records and missing relationships

Data Quality Checks

SELECT * FROM products p WHERE NOT EXISTS (SELECT 1 FROM categories c WHERE c.id = p.category_id);

Data quality team identifies products without valid categories for cleanup.

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