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Updated on 2024-11-08 GMT+08:00
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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

Table 1 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.

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 percentile(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, percentile(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      |
+------------+------------+
Parent topic: Aggregate Functions