Example (standard-style syntax). Verify supported keywords in your database.
SELECT employee_id, salary, RANK() OVER (PARTITION BY department_id ORDER BY salary DESC) AS salary_rank FROM employees;SQL Window functions
Calculate values across related rows without collapsing the result set.
Syntax
function(...) OVER (PARTITION BY ... ORDER BY ...);Examples
SQLite-oriented variant; dialect behaviour may differ.
SELECT employee_id, salary, RANK() OVER (PARTITION BY department_id ORDER BY salary DESC) AS salary_rank FROM employees;Parameters, options and clauses
| Option / clause | Description |
|---|---|
SELECT / expression | Choose output columns, expressions, aliases or functions. |
FROM / JOIN | Choose source tables and combine related rows. |
WHERE | Filter rows before grouping; use IS NULL for null checks. |
GROUP BY / HAVING | Group rows and filter aggregate groups. |
ORDER BY | Sort the result; ASC is commonly the default and DESC reverses it. |
LIMIT / OFFSET / FETCH | Limit or skip rows; syntax differs by database dialect. |
Dialect references
Review a command and its target before running it. Commands that alter files, services, accounts, disks, permissions or databases may be difficult to reverse. Test in a safe environment and keep backups.