Aggregate Functions
The syntax of a complete analysis statement is as follows:
1 2 3 4 | SELECT [DISTINCT] (* | expression) [AS alias] [, ...] [GROUP BY expression [, ...] [HAVING predicates]] [ORDER BY expression [ASC | DESC] [, ...]] [LIMIT size OFFSET offset] |
This section describes some aggregate functions.
Function | Purpose | Description | Example Value |
|---|---|---|---|
avg | Average value | avg(number T) -> T | SELECT avg(age) LIMIT 1 |
sum | Sum | sum(number T) -> T | SELECT sum(age) LIMIT 1 |
min | Specifies the minimum value. | min(number T) -> T | SELECT min(age) LIMIT 1 |
max | Maximum value | max(number T) -> T | SELECT max(age) LIMIT 1 |
count | Occurrences | count(field) -> integer , count(*) -> integer , count(1) -> integer | SELECT count(age) LIMIT 1 , SELECT count(*) LIMIT 1 , SELECT count(1) LIMIT 1 |
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