计数在SQL中特定事件之前和之后的事件数量? [英] Count number of events before and after a particular event in SQL?
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问题描述
我有一个包含日期和事件的表.有一个名为"A"的事件.我想找出在Sql Bigquery中事件"A"之前和之后发生了多少事件.例如
I have a table containing date and events. There is event named 'A'. I want to find out how many events occurred before and after event 'A' in Sql Bigquery. for Example,
User Date Events
123 2018-02-13 D
123 2018-02-12 B
123 2018-02-10 C
123 2018-02-11 A
123 2018-02-01 X
答案会是这样的.
User Event Before After
123 A 2 2
我尝试了很多查询,但是没有用.任何想法,如何解决这个问题?
I have tried many queries but its not working. Any Idea, how to solve this problem?
推荐答案
以下是针对BigQuery标准SQL的
below is for BigQuery Standard SQL
#standardSQL
WITH `project.dataset.events` AS (
SELECT 123 user, '2018-02-13' dt, 'D' event UNION ALL
SELECT 123, '2018-02-12', 'B' UNION ALL
SELECT 123, '2018-02-11', 'A' UNION ALL
SELECT 123, '2018-02-10', 'C' UNION ALL
SELECT 123, '2018-02-01', 'X'
)
SELECT user, event, before, after
FROM (
SELECT user, event,
COUNT(1) OVER(PARTITION BY user ORDER BY dt ROWS BETWEEN UNBOUNDED PRECEDING AND 1 PRECEDING) before,
COUNT(1) OVER(PARTITION BY user ORDER BY dt ROWS BETWEEN 1 FOLLOWING AND UNBOUNDED FOLLOWING ) after
FROM `project.dataset.events`
)
WHERE event = 'A'
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