docs/sql-manual/sql-functions/aggregate-functions/percentile.md

---
{
    "title": "PERCENTILE",
    "language": "en"
}
---

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## PERCENTILE
### Description
#### Syntax

`PERCENTILE(expr, DOUBLE p)`

Calculate the exact percentile, suitable for small data volumes. Sort the specified column in descending order first, and then take the exact p-th percentile. The value of p is between 0 and 1

Parameter Description:
expr: required. The value is an integer (bigint at most).
p: The exact percentile is required. The 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