In Apache Drill, advanced analytics tasks are performed using SQL queries. For window functions, use the OVER() clause with aggregate functions like ROW_NUMBER(), RANK(), DENSE_RANK(), etc., to perform calculations across a set of rows related to the current row.
For aggregations, utilize standard SQL aggregate functions such as COUNT(), SUM(), AVG(), MIN(), and MAX(). Group data by specific columns using the GROUP BY clause for aggregated results.
Joins in Apache Drill are executed using standard SQL join syntax: INNER JOIN, LEFT OUTER JOIN, RIGHT OUTER JOIN, and FULL OUTER JOIN. Join conditions can be specified using the ON keyword or WHERE clause.
Example:
SELECT t1.id, t2.name, AVG(t1.score) OVER (PARTITION BY t1.id ORDER BY t1.date)
FROM table1 t1
INNER JOIN table2 t2 ON t1.id = t2.id
WHERE t1.date >= '2020-01-01'
GROUP BY t1.id, t2.name;
