SQL BigQuery - 如何将日期 (2020-11-14 16:04:15 UTC) 转换为工作日值 (0-6)

Question

我目前正在解决这个问题。这是一些相关的 documentation

我有一个时间日期列，格式为 { 2020-11-14 16:04:15 UTC }。我想以一个对应于星期几的整数 1-7 的列结束。 1 = 星期日和 7 = 星期六。

目前，我有这个在特定日期有效。

SELECT EXTRACT(DAYOFWEEK FROM DATE '2013-12-25') AS the_day

如何将此函数应用于整个列？

感谢您的帮助。

SQL BigQuery

Answer 1

改编自日期函数的文档'Extract'示例 2。 https://cloud.google.com/bigquery/docs/reference/standard-sql/date_functions?hl=ar-YE#extract

SELECT
  date,
  EXTRACT(DAYOFWEEK FROM date) AS the_day
FROM UNNEST(GENERATE_DATE_ARRAY('2015-12-23', '2016-01-09')) AS date
ORDER BY date;

Answer 2

下面是例子。

WITH
org_table AS (
    SELECT DATE('2013-12-25') as org_col
    UNION ALL SELECT '2013-12-26'
    UNION ALL SELECT '2013-12-28'
    UNION ALL SELECT '2013-12-29'
)
SELECT
  org_col,
  EXTRACT(DAYOFWEEK FROM org_col) AS the_day
FROM org_table
ORDER BY org_col
;

p.s。要应用现有查询，请替换 org_table.

WITH
org_table AS (
    SELECT `your_column` as org_col
    FROM `your_table`
)
...

SQL BigQuery - 如何将日期 (2020-11-14 16:04:15 UTC) 转换为工作日值 (0-6)

SQL BigQuery - How to convert date(2020-11-14 16:04:15 UTC) to WEEKDAY value (0-6)

sql

datetime

weekday

google-bigquery