sum - ClickHouse Documentation

sum

Introduced in: v1.1.0 Calculates the sum of numeric values. Syntax

sum(num)

Arguments

num — Column of numeric values. (U)Int* or Float* or Decimal*

Returned value Returns the sum of the values. (U)Int* or Float* or Decimal* Examples Computing sum of employee salaries

Query

CREATE TABLE employees
(
    id UInt32,
    name String,
    salary UInt32
)
ENGINE = Memory;

INSERT INTO employees VALUES
    (87432, 'John Smith', 45680),
    (59018, 'Jane Smith', 72350),
    (20376, 'Ivan Ivanovich', 58900),
    (71245, 'Anastasia Ivanovna', 89210);

SELECT sum(salary) FROM employees;

Response

┌─sum(salary)─┐
│      266140 │
└─────────────┘

Last modified on July 2, 2026

sumCountCalculates the sum of the numbers and counts the number of rows at the same time. The function is used by ClickHouse query optimizer: if there are multiple `sum`, `count` or `avg` functions in a query, they can be replaced to single `sumCount` function to reuse the calculations. The function is rarely needed to use explicitly.