Question

我已经编写了一个Teradata（V 14.10.3.09）查询来获取过去六周的计数（*），即当前时间和一周中的同一天。

对于eaxample，如果current_timestamp是2015-08-25 08：21：43.210000 + 00:00

当table_column CRT_DTTM的值介于2015-08-25 08：00：00.000000和2015-08-25 08：21：43.210000 + 00:00

时，我取的是count（*）

当table_column CRT_DTTM之间的值为

时，计数（*）

2015-08-18 08：00：00.000000 and 2015-08-18 09：00：00.000000
2015-08-11 08：00：00.000000 and 2015-08-11 09：00：00.000000
2015-08-04 08：00：00.000000 and 2015-08-04 09：00：00.000000
2015-07-28 08：00：00.000000 and 2015-07-28 09：00：00.000000
2015-07-21 08：00：00.000000 and 2015-07-21 09：00：00.000000
2015-07-14 08：00：00.000000 and 2015-07-14 09：00：00.000000

我正在使用的查询是：

WITH TEMP_TAB (w0s,w0e,w1s,w1e,w2s,w2e,w3s,w3e,w4s,w4e,w5s,w5e,w6s,w6e) AS
(
SELECT
    TO_TIMESTAMP(TO_CHAR(CURRENT_TIMESTAMP, 'yyyy-mm-dd hh24'),'yyyy-mm-dd hh24') AS w0s
   ,CURRENT_TIMESTAMP AS w0e
   ,(TO_TIMESTAMP(TO_CHAR(CURRENT_TIMESTAMP, 'yyyy-mm-dd hh24'),'yyyy-mm-dd hh24')) - INTERVAL '7' DAY AS w1s
   ,(TO_TIMESTAMP(TO_CHAR(CURRENT_TIMESTAMP, 'yyyy-mm-dd hh24'),'yyyy-mm-dd hh24')) - INTERVAL '7' DAY + INTERVAL '60' MINUTE AS w1e
   ,(TO_TIMESTAMP(TO_CHAR(CURRENT_TIMESTAMP, 'yyyy-mm-dd hh24'),'yyyy-mm-dd hh24')) - INTERVAL '14' DAY AS w2s
   ,(TO_TIMESTAMP(TO_CHAR(CURRENT_TIMESTAMP, 'yyyy-mm-dd hh24'),'yyyy-mm-dd hh24')) - INTERVAL '14' DAY + INTERVAL '60' MINUTE AS w2e
   ,(TO_TIMESTAMP(TO_CHAR(CURRENT_TIMESTAMP, 'yyyy-mm-dd hh24'),'yyyy-mm-dd hh24')) - INTERVAL '21' DAY AS w3s
   ,(TO_TIMESTAMP(TO_CHAR(CURRENT_TIMESTAMP, 'yyyy-mm-dd hh24'),'yyyy-mm-dd hh24')) - INTERVAL '21' DAY + INTERVAL '60' MINUTE AS w3e
   ,(TO_TIMESTAMP(TO_CHAR(CURRENT_TIMESTAMP, 'yyyy-mm-dd hh24'),'yyyy-mm-dd hh24')) - INTERVAL '28' DAY AS w4s
   ,(TO_TIMESTAMP(TO_CHAR(CURRENT_TIMESTAMP, 'yyyy-mm-dd hh24'),'yyyy-mm-dd hh24')) - INTERVAL '28' DAY + INTERVAL '60' MINUTE AS w4e
   ,(TO_TIMESTAMP(TO_CHAR(CURRENT_TIMESTAMP, 'yyyy-mm-dd hh24'),'yyyy-mm-dd hh24')) - INTERVAL '35' DAY AS w5s
   ,(TO_TIMESTAMP(TO_CHAR(CURRENT_TIMESTAMP, 'yyyy-mm-dd hh24'),'yyyy-mm-dd hh24')) - INTERVAL '35' DAY + INTERVAL '60' MINUTE AS w5e
   ,(TO_TIMESTAMP(TO_CHAR(CURRENT_TIMESTAMP, 'yyyy-mm-dd hh24'),'yyyy-mm-dd hh24')) - INTERVAL '42' DAY AS w6s
   ,(TO_TIMESTAMP(TO_CHAR(CURRENT_TIMESTAMP, 'yyyy-mm-dd hh24'),'yyyy-mm-dd hh24')) - INTERVAL '42' DAY + INTERVAL '60' MINUTE AS w6e
)
SELECT ST_NM
     ,SUM(CASE WHEN CRT_DTTM>=w0s AND CRT_DTTM<w0e THEN 1 ELSE 0 END) AS This_hr
     ,SUM(CASE WHEN CRT_DTTM>=w1s AND CRT_DTTM<w1e THEN 1 ELSE 0 END) AS Calls_W1
     ,SUM(CASE WHEN CRT_DTTM>=w2s AND CRT_DTTM<w2e THEN 1 ELSE 0 END) AS Calls_W2
     ,SUM(CASE WHEN CRT_DTTM>=w3s AND CRT_DTTM<w3e THEN 1 ELSE 0 END) AS Calls_W3
     ,SUM(CASE WHEN CRT_DTTM>=w4s AND CRT_DTTM<w4e THEN 1 ELSE 0 END) AS Calls_W4
     ,SUM(CASE WHEN CRT_DTTM>=w5s AND CRT_DTTM<w5e THEN 1 ELSE 0 END) AS Calls_W5
     ,SUM(CASE WHEN CRT_DTTM>=w6s AND CRT_DTTM<w6e THEN 1 ELSE 0 END) AS Calls_W6
FROM XDW_V.INB_CALL_NRT_RPT INNER JOIN TEMP_TAB
ON 1=1
WHERE CRT_DTTM>=w6s
  AND ST_NM IS NOT NULL
GROUP BY ST_NM ORDER BY ST_NM;

现在我要补充的是，在我过去六周的6个计数中，跳过最小值和最大值，并取其余4个计数的平均值。

这可以通过升级/修改此查询来实现，还是必须编写一个全新的查询？如果有人可以帮我查询或提供一些提示，那么它将会有很大的帮助。

是否有可能改善Terada查询以获得结果的最小值，最大值和平均值？

0 个答案: