PARTITION BY Clause

The PARTITION BY clause is a critical component of analytic functions, allowing users to define how to group the rows for calculations. By dividing the result set into partitions, each analytic function operates independently within these subsets. For example:

sqlCopy codeSELECT department_id, salary, RANK() OVER (PARTITION BY department_id ORDER BY salary DESC) AS dept_salary_rank FROM employees;

This query ranks employees within each department based on salary, providing insights into intra-department performance. The PARTITION BY