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1.2 KiB
1.2 KiB
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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
sumCount(x)
Arguments
Returned value
- Tuple
(sum, count)
, wheresum
is the sum of numbers andcount
is the number of rows with not-NULL values.
Type: Tuple.
Example
Query:
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:
┌─sumCount(x)─┐
│ (190,20) │
└─────────────┘
See also
- optimize_syntax_fuse_functions setting.