总和解码声明？

Question

我必须为不同的活动提供计数，其中一些列来自某个表格，但很少有我需要通过加入其他表格。 而在最后一栏我要补充计数 * 5列togather在一个领域 *。请参见下面的我的查询和建议的最好的方式来实现我的结果:)

SELECT web. OID,web. MARKETING_GROUP, 
    SUM(DECODE(WEB.EVENT_TYPE,5,WEB.ACTIVITY_COUNT,0)) AS DISCUSSIONCOMMENT , 
    SUM(DECODE(WEB.EVENT_TYPE,6,WEB.ACTIVITY_COUNT,0)) AS DISCUSSIONSTART , 
    SUM(DECODE(WEB.EVENT_TYPE,7,WEB.ACTIVITY_COUNT,0)) AS DISCUSSIONVIEW, 
    SUM(case when o.when _clicked is not null then c(*))AS clickcount, 
    **SUM(case when WEB.EVENT_TYPE in(5,6,7,8)then WEB.ACTIVITY_COUNT +c.count(*))as Total** --------- This is where I am getting stuck and confused??? 
    from GMMI_AIR.WEB_ACTIVITY_FCT WEB join GMMI_AIR.COUPON_WEB_ACTIVITY C 
    on WEB.OID_WEB_ACTIVITY_FCT = C.OID_COUPON_WEB_ACTIVITY 

我真的因为连接的表没有命名为activity_count或activity_type，所以查看计数我只能计数（*），但要将所有其他文件添加到一列中，并总结它非常混淆？

任何帮助??/

Answer 1

SELECT web. OID,web. MARKETING_GROUP, 
    SUM(DECODE(WEB.EVENT_TYPE,5,WEB.ACTIVITY_COUNT,0)) AS DISCUSSIONCOMMENT , 
    SUM(DECODE(WEB.EVENT_TYPE,6,WEB.ACTIVITY_COUNT,0)) AS DISCUSSIONSTART , 
    SUM(DECODE(WEB.EVENT_TYPE,7,WEB.ACTIVITY_COUNT,0)) AS DISCUSSIONVIEW, 
    SUM(case when o.when _clicked is not null then c(*))AS clickcount, 
    SUM(case when WEB.EVENT_TYPE in(5,6,7,8)then WEB.ACTIVITY_COUNT END) +c.count(*) as Total 
from GMMI_AIR.WEB_ACTIVITY_FCT WEB join GMMI_AIR.COUPON_WEB_ACTIVITY C 
    on WEB.OID_WEB_ACTIVITY_FCT = C.OID_COUPON_WEB_ACTIVITY 
GROUP BY web. OID,web. MARKETING_GROUP; 

您正在使用哪个数据库