WINDOW FUNCTION SUM
Description
This function calculates the sum of the data within the window.
SUM([DISTINCT | ALL] expression) [OVER (analytic_clause)]Example
Group the data by the property column, and calculate the sum of all the x in the current row and the rows above and below it within the group.
select x, property,
sum(x) over
(
partition by property
order by x
rows between 1 preceding and 1 following
) as 'moving total'
from int_t where property in ('odd','even');
| x | property | moving total |
|----|----------|--------------|
| 2 | even | 6 |
| 4 | even | 12 |
| 6 | even | 18 |
| 8 | even | 24 |
| 10 | even | 18 |
| 1 | odd | 4 |
| 3 | odd | 9 |
| 5 | odd | 15 |
| 7 | odd | 21 |
| 9 | odd | 16 |Keywords
WINDOW,FUNCTION,SUM