percentile¶
This function is used to return the numerical value at a certain percentage point within a range of values.
Syntax¶
percentile(BIGINT col, p)
Parameters¶
Parameter | Mandatory | Description |
|---|---|---|
col | Yes | Columns with a data type of numeric. If the values are of any other type, NULL is returned. |
p | Yes | The value should be between 0 and 1. Otherwise, NULL is returned. |
Return Values¶
The return value is of the DOUBLE type.
Note
The value should be between 0 and 1. Otherwise, NULL is returned.
Example Code¶
Calculates the 0.5 percentile of all offering inventories (items). An example command is as follows:
select stddev_samp(items,0.5) from warehouse;
The command output is as follows:
_c0 500.6
When used with group by, it groups all offerings by warehouse (warehourseId) and returns the 0.5 percentile of the offering inventory (items) in the same group. An example command is as follows:
select warehourseId, stddev_samp(items, 0.5) from warehourse group by warehourseId;
The command output is as follows:
warehouseId _c1 city1 499.6 city2 354.8 city3 565.7