mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-01 03:52:15 +00:00
47 lines
1.3 KiB
Markdown
47 lines
1.3 KiB
Markdown
---
|
|
slug: /en/sql-reference/aggregate-functions/reference/sumcount
|
|
sidebar_position: 196
|
|
title: sumCount
|
|
---
|
|
|
|
Calculates 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.
|
|
|
|
**Syntax**
|
|
|
|
``` sql
|
|
sumCount(x)
|
|
```
|
|
|
|
**Arguments**
|
|
|
|
- `x` — Input value, must be [Integer](../../../sql-reference/data-types/int-uint.md), [Float](../../../sql-reference/data-types/float.md), or [Decimal](../../../sql-reference/data-types/decimal.md).
|
|
|
|
**Returned value**
|
|
|
|
- Tuple `(sum, count)`, where `sum` is the sum of numbers and `count` is the number of rows with not-NULL values.
|
|
|
|
Type: [Tuple](../../../sql-reference/data-types/tuple.md).
|
|
|
|
**Example**
|
|
|
|
Query:
|
|
|
|
``` sql
|
|
CREATE TABLE s_table (x Int8) Engine = Log;
|
|
INSERT INTO s_table SELECT number FROM numbers(0, 20);
|
|
INSERT INTO s_table VALUES (NULL);
|
|
SELECT sumCount(x) from s_table;
|
|
```
|
|
|
|
Result:
|
|
|
|
``` text
|
|
┌─sumCount(x)─┐
|
|
│ (190,20) │
|
|
└─────────────┘
|
|
```
|
|
|
|
**See also**
|
|
|
|
- [optimize_syntax_fuse_functions](../../../operations/settings/settings.md#optimize_syntax_fuse_functions) setting.
|