Question

我正在尝试进行以下查询：

SELECT m.name,s.category,
'$' || cast((select avg(retail) from STOCK
              INNER JOIN MANUFACTURER
              ON STOCK.DEALERID=MANUFACTURER.DEALERID
               WHERE s.category='sedan' or s.category='suv') 
               as decimal(4,2)) as AVG_RRP 
 from manufacturer m 
      join stock s 
      using (DEALERID)
       WHERE (select(sum(retail) from stock)/
              (select count(distinct category) from manufacturer)) >5000

需要输出：

我想显示制造商名称和库存类别
我想生成一个计算字段，我发现HONDA和GM的平均零售价格格式为$ XX.XX
我还要列出所有类别的平均零售价格超过5000

表格格式：

MANFACTURER: DEALERID#,name,phone,state
STOCK: VIN#,name,pudate,dealerid,cost,retail,sdiscount,category

期望的输出：

Manufactuer Name - Stock Category - (Calculated Field)
Honda              Sedan            $XX.XX

我正在使用oracle 11g isql

非常感谢任何帮助

Answer 1

如果我的理解是正确的......这就是你需要实现的目标

需要显示轿车和suv的平均零售价
需要显示除轿车和SUV以外的其他类别的平均零售价格总和（库存）/计数（类别）＆gt; 5000

希望以下代码可以帮助您

select m.name,
       s.category,
       avg(retail) 
 from STOCK s ,
      MANUFACTURER m 
where 
     STOCK.DEALERID=MANUFACTURER.DEALERID 
     and (s.category='sedan' or s.category='suv') 
Group by m.name,s.cateogry 

Union 

select m.name,
       s.category,
       avg(retail) 
from STOCK s ,
     MANUFACTURER m 
where 
   STOCK.DEALERID=MANUFACTURER.DEALERID 
AND (select(sum(retail) from 
            stock s ,manufacturer m 
            where STOCK.DEALERID=MANUFACTURER.DEALERID 
            and (s.category !='sedan' or s.category !='suv') 
      )/ 
       select count(distinct category) 
          from stock s ,manufacturer m 
           where STOCK.DEALERID=MANUFACTURER.DEALERID 
           and (s.category !='sedan' or s.category !='suv') )) >5000 
Group by m.name,s.cateogry

您可以根据自己的意愿提供$符号和roundings

可以有更好的方法..但是我很快就会想到这个......并检查

嵌套SQL和带有WHERE CLAUSE ISSUE的计算字段

1 个答案: