T-SQL：WHERE子句中OVER（PARTITION BY ... ORDER BY ...）

Question

我有以下查詢

;WITH tmp AS 
(
    SELECT *, ROW_NUMBER() 
    OVER 
     (PARTITION BY to_tel, duration, call_date 
     ORDER BY rates_start DESC) as rn 
    FROM ##TempTable 
) 
SELECT * 
FROM tmp 
WHERE rn = 1 
ORDER BY customer_id, to_code, duration 

但我想修改它在它不給我最高rates_start，但在特定日期之前的最高rates_start。有什麼辦法可以做到這一點？

Answer 1

您可以在cte部分內添加WHERE。我不知道在這種情況下你是否仍然想用call_date進行分區（我刪除了它）。如有需要，更換PARTITION BY部件。

;WITH tmp AS 
(
    SELECT *, ROW_NUMBER() 
    OVER 
     (PARTITION BY to_tel, duration 
     ORDER BY rates_start DESC) as rn 
    FROM ##TempTable 
    WHERE call_date < @somedate 
) 
SELECT * 
FROM tmp 
WHERE rn = 1 
ORDER BY customer_id, to_code, duration