Question

我正在使用BigQuery 标准SQL。

我需要将时间戳转换为星期几名称。

e.g。将今天的时间戳（2016-11-24 00:00:00）转换为字符串：'Thursday'

谢谢：）

Answer 1

以下是BigQuery Standard SQL

#standardSQL
SELECT 
  CURRENT_DATE() AS day,
  FORMAT_DATE('%a', CURRENT_DATE()) AS weekday_name_abbreviated,
  FORMAT_DATE('%A', CURRENT_DATE()) AS weekday_name_full

或

#standardSQL
SELECT 
  DATE('2016-11-24 00:00:00') AS day,
  FORMAT_DATE('%a', DATE('2016-11-24 00:00:00')) AS weekday_name_abbreviated,
  FORMAT_DATE('%A', DATE('2016-11-24 00:00:00')) AS weekday_name_full

结果是

day         weekday_name_abbreviated    weekday_name_full    
2016-11-24  Thu                         Thursday

Answer 2

您必须使用DAYOFWEEK（）然后使用CASE语句返回星期几。 DAYOFWEEK（）以1（星期日）和7（星期六）之间的整数形式返回星期几。 Date and time functions

e.g。

SELECT 
  CASE 
    WHEN DAYOFWEEK(CURRENT_DATE()) = 1 THEN 'Sunday'
    WHEN DAYOFWEEK(CURRENT_DATE()) = 2 THEN 'Monday'
    WHEN DAYOFWEEK(CURRENT_DATE()) = 3 THEN 'Tuesday'
    WHEN DAYOFWEEK(CURRENT_DATE()) = 4 THEN 'Wednesday'
    WHEN DAYOFWEEK(CURRENT_DATE()) = 5 THEN 'Thursday'
    WHEN DAYOFWEEK(CURRENT_DATE()) = 6 THEN 'Friday'
    WHEN DAYOFWEEK(CURRENT_DATE()) = 7 THEN 'Saturday'
  END Weekday

Answer 3

在 BigQuery 中，您可以使用：

C++11

它返回一个整数：1=星期一，7=星期日

BigQuery Standart SQL：从时间戳中提取星期几的名称

3 个答案: