Question

我有两个表，一个存储查询（e_key），一个存储附加到该查询的事件。这些事件具有指定的时间长度。我想加总查询的总时间，然后使用CASE将其分配给三个尺寸类别之一，我将其用作条形图上的x轴。

我正在使用它在我们选择的集成图表软件上设置“维度”字段：

CASE WHEN SUM(Events.EVENT_TIME_SPENT) < 1 THEN 'a. Light Touch' WHEN SUM(Events.EVENT_TIME_SPENT) >= 1 AND SUM(Events.EVENT_TIME_SPENT) < 3 THEN 'b. Medium Intensity' WHEN SUM(Events.EVENT_TIME_SPENT) >= 3 THEN 'c. High Intensity' ELSE 'Unspecified' END

，我得到“聚合函数在调用它的上下文中无效”。这是因为将选择复制到GROUP BY时，它不喜欢使用SUM（）。

这是图表生成的完整SQL（y轴上的e_key计数，x轴上的大小带）：

SELECT COUNT(distinct(Enquiry.E_KEY)) AS S1, CASE WHEN SUM(Events.EVENT_TIME_SPENT) < 1 THEN 'a. Low Intensity' WHEN SUM(Events.EVENT_TIME_SPENT) >= 1 AND SUM(Events.EVENT_TIME_SPENT) < 3 THEN 'b. Medium Intensity' WHEN SUM(Events.EVENT_TIME_SPENT) >= 3 THEN 'c. High Intensity' ELSE 'Unspecified' END AS D1
FROM 
   DB2ADMIN.F_ENQUIRY Enquiry
   LEFT JOIN DB2ADMIN.F_EVENTS Events ON Enquiry.E_KEY = Events.EVENT_KEY
    JOIN DB2ADMIN.F_PRIORITY EnquiryType ON Enquiry.E_PRIORITY_LINK = EnquiryType.PRIORITY_NO
WHERE 
   (EnquiryType.PRIORITY_NAME =  'Enquiry'  ) 
AND   (Enquiry.e_job_type_link=0)
AND   (Events.EVENT_TYPE=2)
GROUP BY CASE WHEN SUM(Events.EVENT_TIME_SPENT) < 1 THEN 'a. Low Intensity' WHEN SUM(Events.EVENT_TIME_SPENT) >= 1 AND SUM(Events.EVENT_TIME_SPENT) < 3 THEN 'b. Medium Intensity' WHEN SUM(Events.EVENT_TIME_SPENT) >= 3 THEN 'c. High Intensity' ELSE 'Unspecified' END
ORDER BY CASE WHEN SUM(Events.EVENT_TIME_SPENT) < 1 THEN 'a. Low Intensity' WHEN SUM(Events.EVENT_TIME_SPENT) >= 1 AND SUM(Events.EVENT_TIME_SPENT) < 3 THEN 'b. Medium Intensity' WHEN SUM(Events.EVENT_TIME_SPENT) >= 3 THEN 'c. High Intensity' ELSE 'Unspecified' END

我无法使用该接口将SELECT与GROUP BY部分分开。关于实现此目标的不同方法有什么想法？如果将“类型”设置为“度量”而不是“尺寸”，则它可以按预期工作，但是无法在x轴上使用它。如果我在EVENT_TIME_SPENT周围设置了除SUM（）以外的相同字段，则可以将“类型”设置为“维”，并且仍然可以使用。

Answer 1

您不需要GROUP BY中的聚合。

就这样，您只想向后退一行吗？

SELECT COUNT(distinct(E_KEY)) AS S1
,      CASE WHEN SUM(Events.EVENT_TIME_SPENT) < 1 THEN 'a. Low Intensity' 
           WHEN SUM(Events.EVENT_TIME_SPENT) >= 1 AND SUM(Events.EVENT_TIME_SPENT) < 3 
            THEN 'b. Medium Intensity'
           WHEN SUM(Events.EVENT_TIME_SPENT) >= 3 THEN 'c. High Intensity' 
           ELSE 'Unspecified' END AS D1
FROM 
   TABLE(VALUES(1,1),(1,2),(2,2)) AS Events (E_KEY, EVENT_TIME_SPENT)

返回

 S1     D1
 --     -----------------
  2     c. High Intensity

如果您要按某项分组，则例如可行

SELECT E_KEY AS S1
,      CASE WHEN SUM(Events.EVENT_TIME_SPENT) < 1 THEN 'a. Low Intensity' 
           WHEN SUM(Events.EVENT_TIME_SPENT) >= 1 AND SUM(Events.EVENT_TIME_SPENT) < 3 
            THEN 'b. Medium Intensity'
           WHEN SUM(Events.EVENT_TIME_SPENT) >= 3 THEN 'c. High Intensity' 
           ELSE 'Unspecified' END AS D1
FROM 
   TABLE(VALUES(1,1),(1,2),(2,2)) AS Events (E_KEY, EVENT_TIME_SPENT)
GROUP BY
    E_KEY


 S1     D1
 --     -------------------
  1     c. High Intensity
  2     b. Medium Intensity

或者如果您不想以任何方式对EVENT_TIME_SPENT进行SUM（），那么您可能会在此之后

SELECT COUNT(DISTINCT E_KEY) AS S1
,      CASE WHEN Events.EVENT_TIME_SPENT < 1 THEN 'a. Low Intensity' 
           WHEN Events.EVENT_TIME_SPENT >= 1 AND Events.EVENT_TIME_SPENT < 3 
            THEN 'b. Medium Intensity'
           WHEN Events.EVENT_TIME_SPENT >= 3 THEN 'c. High Intensity' 
           ELSE 'Unspecified' END AS D1
FROM 
   TABLE(VALUES(1,1),(1,2),(2,2),(2,0),(1,4)) AS Events (E_KEY, EVENT_TIME_SPENT)
GROUP BY
    CASE WHEN Events.EVENT_TIME_SPENT < 1 THEN 'a. Low Intensity' 
           WHEN Events.EVENT_TIME_SPENT >= 1 AND Events.EVENT_TIME_SPENT < 3 
            THEN 'b. Medium Intensity'
           WHEN Events.EVENT_TIME_SPENT >= 3 THEN 'c. High Intensity' 
           ELSE 'Unspecified' END

 S1 D1
 -- -------------------
  1 a. Low Intensity   
  2 b. Medium Intensity
  1 c. High Intensity

在CASE中进行汇总

1 个答案: