Question

我有下表：

site||kw||date
M   ||50||1-1-2013
A   ||60||1-1-2013
...

我需要显示，在两个日期之间进行过滤

Site||avg(kw)||MAX_KW_PERIOD||MAX_KW_TOTAL

MAX_KW_PERIOD两个日期之间的最大kw值和MAX_KW_TOTAL最大历史值kw。

我尝试使用联合查询：

SELECT Site,
       avg(TM.kw) "AVG_KW", 
       MAX(TM.kwGen) "MAX KW PERIOD",
       TO_NUMBER(NULL) "MAX_TOTAL"
  FROM TABLE
 WHERE DATE BETWEEN DATE1 
                AND DATE2
GROUP BY 
       Site
UNION
SELECT Site,
       TO_NUMBER(NULL)"AVG_kW",
       TO_NUMBER(NULL)"MAX KW PERIOD",
       MAX(TM.kwGEN) "MAX TOTAL" 
  FROM TABLE
GROUP BY 
       Site

但我获得了：

SITE||AVG_KW||MAX_KW PERIOD||MAX TOTAL
   A||100   ||110          ||(null)
   A||(null)||(null)       ||160

如何只为网站获取一行

SITE||AVG_KW||MAX_KW PERIOD||MAX TOTAL
   A||100   ||110          ||160

非常感谢。

Answer 1

试试这个：

with maxkw as
((SELECT site, MAX(kw) maxtotal FROM tbl t GROUP BY SITE)),

avgkw as
(SELECT t.Site,
        avg(kw) "AVG_KW", 
        MAX(kw) "MAX_KW_PERIOD"--,
 FROM tbl t 
 WHERE DATE BETWEEN '20130101' AND '20130104'
 GROUP BY t.Site)

 select t.site, t.avg_kw, t.max_kw_period, c.maxtotal
 from avgkw t
 inner join maxkw c on t.site = c.site

ORACLE SQL QUERY联合

1 个答案: