NTILE

Purpose

This function distributes the rows of an ordered partition into a specified number of buckets. For each row, this function returns the index of the bucket to which the row belongs.

Usage Notes

• NTILE is only available as an analytic function (i.e., in combination with an over_clause). For more information, refer to Analytic Functions section.
• The expr has to be a numeric value with scale 0. The expr has to be constant within a partition. This implies that expr may depend on the partitioning attribute. Thus expr may vary in different partitions but must remain constant for all rows within a partition. Exasol returns an error if this condition is not satisfied.
• NTILE requires an order_clause.
• NTILE does not allow the use of a window_frame_clause. It uses the entire partition as window for the computation of the result.

Example

Analytic Function

SELECT 
    id, department, hire_date, 
    NTILE(3) OVER (PARTITION BY department ORDER BY hire_date) NTILE 
FROM employee_table ORDER BY department, hire_date;

Result