有没有一种方法可以在Teradata中重用窗口？

Question

I would like to reuse the same window definition multiple times within a single query.

Postgres does it this way:

SELECT sum(salary) OVER w, avg(salary) OVER w
FROM empsalary
WINDOW w AS (PARTITION BY depname ORDER BY salary DESC);

Does teradata have an equivalent function to do this?

Answer 1

there is no equivalent of window function in TD, you have to write window every time

SELECT sum(salary) OVER (PARTITION BY depname ORDER BY salary DESC), avg(salary) OVER (PARTITION BY depname ORDER BY salary DESC)
FROM empsalary;

Some documents about window functions:

http://www.info.teradata.com/HTMLPubs/DB_TTU_14_00/index.html#page/SQL_Reference/B035_1145_111A/Ordered_Analytical_Functions.083.013.html

http://www.info.teradata.com/HTMLPubs/DB_TTU_14_00/index.html#page/SQL_Reference/B035_1145_111A/Ordered_Analytical_Functions.083.012.html#ww1271958