如何在 BigQuery 中提取两个时间戳之间的唯一日期? [英] How to extract unique days between two timestamps in BigQuery?

问题描述

对于两个不同的时间戳，假设时间戳('2015-02-01')和时间戳('2015-02-12')，我想要一个包含所有日期的列.像这样(12行)2015-02-012015-02-02...2015-02-12

for two different timestamps, let's say timestamp('2015-02-01') and timestamp ('2015-02-12'), I want a column with all the dates in between. Like this (12 Rows) 2015-02-01 2015-02-02 . . . 2015-02-12

推荐答案

您可以通过对公共数据集 (fh-bigquery:geocode.numbers_65536) 进行交叉联接来实现，其中您有数字至:65536

You can do that with a cross join on a public dataset (fh-bigquery:geocode.numbers_65536) where you have numbers up to: 65536

SELECT date(DATE_ADD(DAY, i, "DAY")) DAY
FROM
  (SELECT '2015-01-01' AS DAY) a CROSS
JOIN
  (SELECT i
   FROM [fh-bigquery:geocode.numbers_65536]
   WHERE i<=abs(DATEDIFF('2015-01-01','2015-01-15'))) b
ORDER BY DAY ASC

这个输出:

+-----+------------+---+
| Row |    day     |   |
+-----+------------+---+
|   1 | 2015-01-01 |   |
|   2 | 2015-01-02 |   |
|   3 | 2015-01-03 |   |
|   4 | 2015-01-04 |   |
|   5 | 2015-01-05 |   |
|   6 | 2015-01-06 |   |
|   7 | 2015-01-07 |   |
|   8 | 2015-01-08 |   |
|   9 | 2015-01-09 |   |
|  10 | 2015-01-10 |   |
|  11 | 2015-01-11 |   |
|  12 | 2015-01-12 |   |
|  13 | 2015-01-13 |   |
|  14 | 2015-01-14 |   |
|  15 | 2015-01-15 |   |
+-----+------------+---+

您可以通过使用项目菜单(项目名称旁边的下拉菜单，切换到项目 ➪ 显示项目)添加项目 fh-bigquery 来将此数据添加到 BigQuery UI 中的视图).或者，您可以导航到 BigQuery UI 链接 https://bigquery.cloud.google.com/project/fh-bigquery添加项目后，示例数据集 (fh-bigquery) 将出现在导航面板中.

You can add this data to your view in the BigQuery UI by adding the project fh-bigquery using the project menu (the drop-down next to the project name, Switch to Project ➪ Display Project). Alternately, you can navigate to the BigQuery UI link https://bigquery.cloud.google.com/project/fh-bigquery After you add the project, the sample dataset (fh-bigquery) appears in the navigation panel.

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