返回當前窗口框架中第 N 行的 值

WITH finishers AS(SELECT 'Sophia Liu' as name,TIMESTAMP '2016-10-18 2:51:45' as finish_time,'F30-34' as divisionUNION ALL SELECT 'Lisa Stelzner', TIMESTAMP '2016-10-18 2:54:11', 'F35-39'UNION ALL SELECT 'Nikki Leith', TIMESTAMP '2016-10-18 2:59:01', 'F30-34'UNION ALL SELECT 'Lauren Matthews', TIMESTAMP '2016-10-18 3:01:17', 'F35-39'UNION ALL SELECT 'Desiree Berry', TIMESTAMP '2016-10-18 3:05:42', 'F35-39'UNION ALL SELECT 'Suzy Slane', TIMESTAMP '2016-10-18 3:06:24', 'F35-39'UNION ALL SELECT 'Jen Edwards', TIMESTAMP '2016-10-18 3:06:36', 'F30-34'UNION ALL SELECT 'Meghan Lederer', TIMESTAMP '2016-10-18 3:07:41', 'F30-34'UNION ALL SELECT 'Carly Forte', TIMESTAMP '2016-10-18 3:08:58', 'F25-29'UNION ALL SELECT 'Lauren Reasoner', TIMESTAMP '2016-10-18 3:10:14', 'F30-34') SELECT name,FORMAT_TIMESTAMP('%X', finish_time) AS finish_time,division,FORMAT_TIMESTAMP('%X', fastest_time) AS fastest_time,FORMAT_TIMESTAMP('%X', second_fastest) AS second_fastest FROM (SELECT name,finish_time,division,finishers,FIRST_VALUE(finish_time)OVER w1 AS fastest_time,NTH_VALUE(finish_time, 2)OVER w1 as second_fastestFROM finishersWINDOW w1 AS (PARTITION BY division ORDER BY finish_time ASCROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING));

這里自定義了一個窗口語句

WINDOW w1 AS (PARTITION BY division ORDER BY finish_time ASCROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) namefinish_timedivisionfastest_timesecond_fastest

Carly Forte	03:08:58	F25-29	03:08:58	NULL
Sophia Liu	02:51:45	F30-34	02:51:45	02:59:01
Nikki Leith	02:59:01	F30-34	02:51:45	02:59:01
Jen Edwards	03:06:36	F30-34	02:51:45	02:59:01
Meghan Lederer	03:07:41	F30-34	02:51:45	02:59:01
Lauren Reasoner	03:10:14	F30-34	02:51:45	02:59:01
Lisa Stelzner	02:54:11	F35-39	02:54:11	03:01:17
Lauren Matthews	03:01:17	F35-39	02:54:11	03:01:17
Desiree Berry	03:05:42	F35-39	02:54:11	03:01:17
Suzy Slane	03:06:24	F35-39	02:54:11	03:01:17

總結

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