max

Introduced in: v1.1

Aggregate function that calculates the maximum across a group of values.

Syntax

max(column)

Arguments

column — Column name or expression. Any

Returned value

The maximum value across the group with type equal to that of the input. Any

Examples

Simple max example

CREATE TABLE employees (name String, salary UInt32) ENGINE = Memory;
INSERT INTO employees VALUES ('Alice', 3000), ('Bob', 4000), ('Charlie', 3500);

SELECT max(salary) FROM employees;

┌─max(salary)─┐
│        4000 │
└─────────────┘

Max with GROUP BY

CREATE TABLE sales (department String, revenue UInt32) ENGINE = Memory;
INSERT INTO sales VALUES ('Engineering', 100000), ('Engineering', 120000), ('Marketing', 80000), ('Marketing', 90000);

SELECT department, max(revenue) FROM sales GROUP BY department ORDER BY department;

┌─department──┬─max(revenue)─┐
│ Engineering │       120000 │
│ Marketing   │        90000 │
└─────────────┴──────────────┘

Note about non-aggregate maximum

-- If you need non-aggregate function to choose a maximum of two values, see greatest():
SELECT greatest(a, b) FROM table;

max​

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