GROUP_ARRAY_MOVING_AVG
The GROUP_ARRAY_MOVING_AVG function calculates the moving average of input values. The function can take the window size as a parameter. If left unspecified, the function takes the window size equal to the number of input values.
Syntax
GROUP_ARRAY_MOVING_AVG(<expr>)
GROUP_ARRAY_MOVING_AVG(<window_size>)(<expr>)
Arguments
Arguments | Description |
---|---|
<window_size> | Any numerical expression |
<expr> | Any numerical expression |
Return Type
Returns an Array with elements of double or decimal depending on the source data type.
Examples
-- Create a table and insert sample data
CREATE TABLE hits (
user_id INT,
request_num INT
);
INSERT INTO hits (user_id, request_num)
VALUES (1, 10),
(2, 15),
(3, 20),
(1, 13),
(2, 21),
(3, 25),
(1, 30),
(2, 41),
(3, 45);
SELECT user_id, GROUP_ARRAY_MOVING_AVG(2)(request_num) AS avg_request_num
FROM hits
GROUP BY user_id;
| user_id | avg_request_num |
|---------|------------------|
| 1 | [5.0,11.5,21.5] |
| 3 | [10.0,22.5,35.0] |
| 2 | [7.5,18.0,31.0] |