How to extract unique days between two timestamps in BigQuery?

Question

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-

Answer 1

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

this outputs:

+-----+------------+---+
| 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 |   |
+-----+------------+---+

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.