DB2查询休眠条件

我有一个特定的DB2查询,我想使用条件执行这个查询。

SELECT
 sum(units) as volume,
 location_id, 
 aged
FROM (
 SELECT
   units,
   location_id,

   CASE
    WHEN daysinstock < 61 THEN 'NOT_AGED'
    WHEN daysinstock < 91 THEN 'AGED'
    ELSE 'OVER_AGED'
   END AS AGED 

  FROM 
   STOCK_TABLE
) x
group by location_id, aged

此表由具有相同字段的StockDataSource对象匹配。