PERCENTILE

Description

Syntax

PERCENTILE(expr, DOUBLE p)

Calculates the exact percentile for small amounts of data. The specified columns are sorted in descending order and then the exact p percentile is taken. The value of p is between 0 and 1. If p does not point to an exact position, the linear interpolation of the values adjacent to either side of the pointed position at the position pointed to by p is returned. Note that this is not an average of the two numbers.

Parameters: expr: required. The value is an integer (bigint at most). p: required. The const value is [0.0,1.0].

Example

MySQL > select `table`, percentile(cost_time,0.99) from log_statis group by `table`;
+---------------------+---------------------------+
| table    |         percentile(`cost_time`, 0.99)|
+----------+--------------------------------------+
| test     |                                54.22 |
+----------+--------------------------------------+

MySQL > select percentile(NULL,0.3) from table1;
+-----------------------+
| percentile(NULL, 0.3) |
+-----------------------+
|                  NULL |
+-----------------------+

Keywords

PERCENTILE