width_bucket

width_bucket 介绍

width_bucket(value, min_value, max_value, num_bucket) - 返回在范围从min_value到max_value的等宽直方图中，value将被分配到的桶编号，该直方图有num_bucket个桶。

Examples:

> SELECT width_bucket(5.3, 0.2, 10.6, 5);
 3
> SELECT width_bucket(-2.1, 1.3, 3.4, 3);
 0
> SELECT width_bucket(8.1, 0.0, 5.7, 4);
 5
> SELECT width_bucket(-0.9, 5.2, 0.5, 2);
 3
> SELECT width_bucket(INTERVAL '0' YEAR, INTERVAL '0' YEAR, INTERVAL '10' YEAR, 10);
 1
> SELECT width_bucket(INTERVAL '1' YEAR, INTERVAL '0' YEAR, INTERVAL '10' YEAR, 10);
 2
> SELECT width_bucket(INTERVAL '0' DAY, INTERVAL '0' DAY, INTERVAL '10' DAY, 10);
 1
> SELECT width_bucket(INTERVAL '1' DAY, INTERVAL '0' DAY, INTERVAL '10' DAY, 10);
 2

Since: 3.1.0

when window