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https://github.com/ClickHouse/ClickHouse.git
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3cc0829cc1
This commit prevents stateful functions like rowNumberInAllBlocks from being modified in getHeader() calls.
38 lines
975 B
SQL
38 lines
975 B
SQL
-- https://stackoverflow.com/questions/53416531/clickhouse-moving-average
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DROP TABLE IF EXISTS test.bm;
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USE test;
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CREATE TABLE bm (amount float, business_dttm DateTime) engine Log;
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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');
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WITH
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(
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SELECT arrayCumSum(groupArray(amount))
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FROM
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(
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SELECT
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amount
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FROM bm
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ORDER BY business_dttm
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)
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) AS arr,
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1 + rowNumberInAllBlocks() AS id,
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3 AS window_size
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SELECT
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amount,
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business_dttm,
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if(id < window_size, NULL, round(arr[id] - arr[id - window_size], 4)) AS moving_sum
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FROM
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(
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SELECT
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amount,
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business_dttm
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FROM bm
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ORDER BY business_dttm
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);
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DROP TABLE test.bm;
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