Question

我有以下查询

;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

但是我想修改它，它不会给我最大的rates_start，但是在特定日期之前的最大rate_start。我有什么方法可以做到这一点吗？

Answer 1

您可以在cte部分中添加WHERE。在这种情况下，我不确定您是否仍希望按call_date进行分区（我将其删除）。如果需要，请更改PARTITION BY部分。

;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

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

1 个答案: