Question

这可以作为一个魅力，从我的表中检索所有唯一（年，月）组合：

SELECT
  STRFTIME_UTC_USEC(TIMESTAMP_TO_USEC(Date), '%Y-%m') as month,
FROM
  [Table]

返回2016-05,2016-06,2016-07等

想要为（年，季）做同样的事情但却一无所获。有小费吗？我知道季度在sql上非常棘手。谢谢！

Answer 1

将QUARTER功能与YEAR功能结合使用：

select concat(string(year(timestamp)),'-Q',string(quarter(timestamp))) as mquerter
from [table]
group by 1

Answer 2

为了完整起见，您可以使用standard SQL（取消选中用户界面中“显示选项”下的“使用旧版SQL”）：

SELECT DISTINCT EXTRACT(YEAR FROM t), EXTRACT(QUARTER FROM t)
FROM MyTable;

例如：

WITH MyTable AS (
  SELECT t
  FROM UNNEST([TIMESTAMP '2016-01-01',
               TIMESTAMP '2016-04-03',
               TIMESTAMP '2016-02-28',
               TIMESTAMP '2017-06-25']) AS t
)
SELECT DISTINCT
  EXTRACT(YEAR FROM t) AS year,
  EXTRACT(QUARTER FROM t) AS quarter
FROM MyTable;
+------+---------+
| year | quarter |
+------+---------+
| 2016 | 1       |
| 2016 | 2       |
| 2017 | 2       |
+------+---------+

如何从日期列表中检索所有唯一（年，季）组合？

2 个答案: