SQL Aggregate Functions
Intro
Indexima supports SQL aggregate functions to improve the execution time performance of SQL queries using such aggregate functions.
As a reminder, aggregate functions compute a single result from a set of input values.
The aggregate functions that accept an expression parameter can be modified by the keywords DISTINCT or ALL.
If neither is specified, the result is the same as if "ALL" were specified.
DISTINCT Modifies the expression to include only distinct values that are not NULL
ALL Includes all rows where expression is not NULL
The built-in aggregate functions are listed below
| Command | Description |
|---|---|
AVG( [ DISTINCT | ALL ] expression) | Average (arithmetic mean) of all input expression values |
COUNT(*) | Number of input rows, including rows that are NULL |
COUNT( [ DISTINCT | ALL ] expression ) | Number of input rows where expression value is not equal to NULL |
MAX( [ DISTINCT | ALL ] expression) | Maximum value of expression across all input values |
MIN( [ DISTINCT | ALL ] expression) | Minimum value of expression across all input values |
SUM( [ DISTINCT | ALL ] expression) | Sum of expression across all input values |