DISTINCT & Removing Duplicates: Next

GROUP BY Fundamentals

ROW_NUMBER, RANK, DENSE_RANK

Subquery Types & Classification

Get unique departments from employees table

Find unique customer-product combinations

List unique cities from customers table

Compare SELECT DISTINCT, GROUP BY, and ROW_NUMBER for deduplication.

Finding Duplicates

GROUP BY Fundamentals

ROW_NUMBER, RANK, DENSE_RANK