WINDOW FUNCTION MAX
description
LEAD() 方法用来计算窗口内的最大值。
MAX([DISTINCT | ALL] expression) [OVER (analytic_clause)]example
计算从第一行到当前行之后一行的最大值
select x, property,
max(x) over
(
order by property, x
rows between unbounded preceding and 1 following
) as 'local maximum'
from int_t where property in ('prime','square');
| x | property | local maximum |
|---|----------|---------------|
| 2 | prime | 3 |
| 3 | prime | 5 |
| 5 | prime | 7 |
| 7 | prime | 7 |
| 1 | square | 7 |
| 4 | square | 9 |
| 9 | square | 9 |keywords
WINDOW,FUNCTION,MAX