SQL - 具有 Group By 功能的 CASE 语句

Question

我编写了这个查询并尝试按“D”进行分组，但它不起作用。有什么帮助吗？？

(select hr_id, max(delivery_dt)as maxd,
  (CASE 
    WHEN max(delivery_dt) > '11-may-2010' then '< 6 MO'
    WHEN max(delivery_dt) > '11-may-2004' and  max(delivery_dt) < '11-may-2010'   then '7 - 78 MO'
    WHEN max(delivery_dt) > '11-nov-1999' and  max(delivery_dt) < '11-april-2004' then '79 - 132 MO'
    ELSE '> 133 MO' END) D
from INDIVIDUAL_VE_TB 
where hr_id in (select distinct hr_id from MODEL_SC_TB b where b.model_id='200')
Group by hr_id)

我得到了这个结果

HR                DATE               D
2000001076        4/22/1994         > 133 MO
2000004986        12/13/2004        7 - 78 MO
2000003382        12/13/2003        7 - 78 MO

这是按 HR 分组，我也尝试按 D 分组，但不起作用 我将 D 添加到组中 按 hr_id、D 分组

任何帮助都会很棒!

提前谢谢

Answer 1

你可以尝试:

Select hr_id, max(maxd), D
from
    (select hr_id, max(delivery_dt)as maxd,
      (CASE 
        WHEN max(delivery_dt) > '11-may-2010' then '< 6 MO'
        WHEN max(delivery_dt) > '11-may-2004' and  max(delivery_dt) < '11-may-2010'   then '7 - 78 MO'
        WHEN max(delivery_dt) > '11-nov-1999' and  max(delivery_dt) < '11-april-2004' then '79 - 132 MO'
        ELSE '> 133 MO' END) D
    from INDIVIDUAL_VE_TB 
    where hr_id in (select distinct hr_id from MODEL_SC_TB b where b.model_id='200')
    Group by hr_id)
group by D, hr_id