mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-12 01:12:12 +00:00
36 lines
954 B
SQL
36 lines
954 B
SQL
-- https://stackoverflow.com/questions/53416531/clickhouse-moving-average
|
|
|
|
DROP TABLE IF EXISTS bm;
|
|
|
|
CREATE TABLE bm (amount float, business_dttm DateTime) engine Log;
|
|
|
|
INSERT INTO bm VALUES (0.3,'2018-11-19 13:00:00'), (0.3,'2018-11-19 13:05:00'), (0.4,'2018-11-19 13:10:00'), (0.5,'2018-11-19 13:15:00'), (0.6,'2018-11-19 13:15:00'), (0.7,'2018-11-19 13:20:00'), (0.8,'2018-11-19 13:25:00'), (0.9,'2018-11-19 13:25:00'), (0.5,'2018-11-19 13:30:00');
|
|
|
|
WITH
|
|
(
|
|
SELECT arrayCumSum(groupArray(amount))
|
|
FROM
|
|
(
|
|
SELECT
|
|
amount
|
|
FROM bm
|
|
ORDER BY business_dttm
|
|
)
|
|
) AS arr,
|
|
1 + rowNumberInAllBlocks() AS id,
|
|
3 AS window_size
|
|
SELECT
|
|
amount,
|
|
business_dttm,
|
|
if(id < window_size, NULL, round(arr[id] - arr[id - window_size], 4)) AS moving_sum
|
|
FROM
|
|
(
|
|
SELECT
|
|
amount,
|
|
business_dttm
|
|
FROM bm
|
|
ORDER BY business_dttm
|
|
);
|
|
|
|
DROP TABLE bm;
|