0
试图找出填充此表最后一列的最快方法,streak
列存储运行结果值(win
或loss
)。postgres:SQL和条纹?
game_date | team | result | streak
------------+---------+--------+--------
2017-10-05 | ABC | win | 1
2017-10-07 | ABC | win | 2
2017-10-11 | ABC | loss | 1
2017-10-14 | ABC | win | 1
2017-10-15 | ABC | win | 2
2017-10-18 | ABC | win | 3
2017-10-21 | ABC | win | 4
2017-10-23 | ABC | loss | 1
2017-10-24 | ABC | win | 1
2017-10-26 | ABC | win | 2
2017-10-28 | ABC | win | 3
2017-10-30 | ABC | loss | 1
2017-11-02 | ABC | win | 1
2017-11-04 | ABC | loss | 1
2017-11-07 | ABC | win | 1
2017-11-09 | ABC | loss | 1
2017-11-12 | ABC | loss | 1
2017-11-14 | ABC | loss | 2
2017-11-16 | ABC | loss | 3
2017-11-18 | ABC | win | 1
2017-11-19 | ABC | loss | 1
2017-11-22 | ABC | loss | 2
2017-11-24 | ABC | loss | 3
2017-11-25 | ABC | win | 1
2017-11-28 | ABC | win | 2
2017-11-30 | ABC | win | 3
2017-12-01 | ABC | win | 4
(27 rows)
正如你看到的,streak
应该重置为1时,先结果为空,或者不同的,否则一个递增。