Description: Divides an ordered data set into a number of buckets indicated by expr and assigns the appropriate bucket number to each row. The buckets are numbered 1 through expr. The expr value must resolve to a positive constant for each partition.

NTILE (<expression>) OVER ([query_partition_clause] <order BY clause>)
conn oe/oe
SELECT last_name, salary,
NTILE(4) OVER (ORDER BY salary DESC) AS quartile
FROM employees
WHERE department_id = 100;

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