我的问题是从某个窗口的列中找到第一个值，这里是带查询的示例数据：
WITH finishers AS
(SELECT 'Bob' as name,
TIMESTAMP '2016-10-18 2:51:45' as finish_time,
'F30-34' as division
UNION ALL SELECT NULL, TIMESTAMP '2016-10-18 2:54:11', 'F35-39'
UNION ALL SELECT 'Mary', TIMESTAMP '2016-10-18 2:59:01', 'F35-39'
UNION ALL SELECT 'John', TIMESTAMP '2016-10-18 3:01:17', 'F35-39')
SELECT *,
FIRST_VALUE (name IGNORE NULLS) OVER(PARTITION BY division ORDER BY finish_time) AS fastest_in_division
FROM finishers
ORDER by division
结果是：
Row name finish_time division fastest_in_division
1 Bob 2016-10-18 02:51:45 UTC F30-34 Bob
2 null 2016-10-18 02:54:11 UTC F35-39 **null**
3 …