我怎样才能得到所有日期的结果？
在此查询中，我仅获取 WET>=6 的日期的值。这些天我怎样才能得到“0”？
SELECT
DATE(DTM) AS 'Dia',
CASE
WHEN (AVG(TMP)<13 OR COUNT(WET)=0) THEN '0'
WHEN ((AVG(TMP)>=13 AND AVG(TMP)<17) AND (COUNT(TMP)/4>=0 AND COUNT(TMP)/4<6)) THEN '0'
WHEN ((AVG(TMP)>=13 AND AVG(TMP)<17) AND (COUNT(TMP)/4>=6 AND COUNT(TMP)/4<15)) THEN '1'
WHEN ((AVG(TMP)>=13 AND AVG(TMP)<17) AND (COUNT(TMP)/4>=15 AND COUNT(TMP)/4<20)) THEN '2'
WHEN ((AVG(TMP)>=13 AND AVG(TMP)<17) AND (COUNT(TMP)/4>=20)) THEN '3'
END
AS 'DSV TOMCAST'
FROM dados_meteo
WHERE WET>=6/* AND POM='[VARIABLE]'*/
GROUP BY DATE(DTM)
On this query, I only get values on the days where WET>=6. How can I get ´0´ on these days?
SELECT
DATE(DTM) AS 'Dia',
CASE
WHEN (AVG(TMP)<13 OR COUNT(WET)=0) THEN '0'
WHEN ((AVG(TMP)>=13 AND AVG(TMP)<17) AND (COUNT(TMP)/4>=0 AND COUNT(TMP)/4<6)) THEN '0'
WHEN ((AVG(TMP)>=13 AND AVG(TMP)<17) AND (COUNT(TMP)/4>=6 AND COUNT(TMP)/4<15)) THEN '1'
WHEN ((AVG(TMP)>=13 AND AVG(TMP)<17) AND (COUNT(TMP)/4>=15 AND COUNT(TMP)/4<20)) THEN '2'
WHEN ((AVG(TMP)>=13 AND AVG(TMP)<17) AND (COUNT(TMP)/4>=20)) THEN '3'
END
AS 'DSV TOMCAST'
FROM dados_meteo
WHERE WET>=6/* AND POM='[VARIABLE]'*/
GROUP BY DATE(DTM)
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评论（1）
据我现在的理解，当没有
WET >= 6的记录时，您希望返回默认值。您可以使用此处描述的技术来完成此操作：Oracle：即使没有找到数据，查询也始终只返回一行
As I understand it now, you wanna return a default value when there's no record with
WET >= 6. You can accomplish this with the technique described here:Oracle: Get a query to always return exactly one row, even when there's no data to be found