雪花中的时间戳差异

Question

我想找出每个 id 的两个时间戳之间的时间差。计算时只需要计算从9am till 17pm和weekdays[=14] =]

例如对于第一条记录，必须从 2021-05-19 的 9am 开始计算，因此结果为 45 分钟。第二条记录为330分钟，计算如下：

TIMESTAMPDIFF('minute', '2021-05-19 15:30:00'::timestamp, '2021-05-19 17:00:00'::timestamp) + 
TIMESTAMPDIFF('minute', '2021-05-20 09:00:00'::timestamp, '2021-05-20 13:00:00'::timestamp)

示例数据如下：

WITH t1 AS (
SELECT 'A' AS id, '2021-05-18 18:30:00'::timestamp AS started_at, '2021-05-19 09:45:00'::timestamp AS ended_at UNION ALL
SELECT 'B' AS id, '2021-05-19 15:30:00'::timestamp AS started_at, '2021-05-20 13:00:00'::timestamp AS ended_at
    )
SELECT *
FROM t1

Answer 1

您可以使用以下UDF

create or replace function tsrange_intersection(s string, e string)
  RETURNS double
  LANGUAGE JAVASCRIPT
AS
$$
let minutes = 0
start = new Date(S)
end = new Date(E)
let t = start
while(t < end) {
    if ([1, 2, 3, 4, 5].includes(t.getDay())
      && [9, 10, 11, 12, 13, 14, 15, 16].includes(t.getHours())) {
        minutes += 1
    }
    t = new Date(t.getTime() + 60*1000);
}
return minutes
$$;

其工作原理如下：

WITH t1 AS (
SELECT 'A' AS id, '2021-05-18 18:30:00' AS started_at, '2021-05-19 09:45:00' AS ended_at UNION ALL
SELECT 'B' AS id, '2021-05-19 15:30:00' AS started_at, '2021-05-20 13:00:00' AS ended_at
    )
SELECT tsrange_intersection(started_at, ended_at) minutes
FROM t1;

MINUTES
45
330

雪花中的时间戳差异

Timestamp difference in Snowflake

sql

date

time-series

date-range

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