ClickHouse/docs/en/sql-reference/aggregate-functions/reference/max.md

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---
2022-08-28 14:53:34 +00:00
slug: /en/sql-reference/aggregate-functions/reference/max
sidebar_position: 3
2022-08-28 21:34:50 +00:00
title: max
---
2021-04-28 01:37:44 +00:00
Aggregate function that calculates the maximum across a group of values.
Example:
```
SELECT max(salary) FROM employees;
```
```
SELECT department, max(salary) FROM employees GROUP BY department;
```
If you need non-aggregate function to choose a maximum of two values, see `greatest`:
```
SELECT greatest(a, b) FROM table;
```