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WINDOW-FUNCTION-LAST_VALUE

WINDOW FUNCTION LAST_VALUE

description

LAST_VALUE() 返回窗口范围内的最后一个值。与 FIRST_VALUE() 相反。

LAST_VALUE(expr) OVER(partition_by_clause order_by_clause [window_clause])

example

使用FIRST_VALUE()举例中的数据:

select country, name,    
last_value(greeting)
over (partition by country order by name, greeting) as greeting
from mail_merge;

| country | name | greeting |
|---------|---------|--------------|
| Germany | Boris | Guten morgen |
| Germany | Michael | Guten morgen |
| Sweden | Bjorn | Tja |
| Sweden | Mats | Tja |
| USA | John | Hello |
| USA | Pete | Hello |

keywords

WINDOW,FUNCTION,LAST_VALUE