sql - HIVE:GROUP BY key 错误

Question

hive -e "select a.EMP_ID,
       count(distinct c.SERIAL_NBR) as NUM_CURRENT_EMP,
       count(distinct c.SERIAL_NBR)/count(distinct a.SERIAL_NBR) as DISTINCT_EMP
from   ORDERS_COMBINED_EMPLOYEES as a
inner  join ORDERS_EMPLOYEE_STATS as b
         on a.CPP_ID = b.CPP_ID
left   join (   select SERIAL_NBR, MIN(TRAN_DT) as TRAN_DT
                from   EMP_TXNS
                group  by SERIAL_NBR
            ) c
         on c.SERIAL_NBR = a.SERIAL_NBR
where    c.TRAN_DT > a.LAST_TXN_DT
group by a.EMP_ID
having ( 
          (NUM_CURRENT_EMP >= 25 and DISTINCT_EMP > 0.01)
       ) ; " > EMPLOYEE_ORDERS.txt

收到错误消息，
"FAILED: SemanticException [Error 10025]: Line 15:31 Expression not in GROUP BY key '0.01'".当我在 HAVING子句中仅以一个条件运行与 NUM_CURRENT_EMP >= 25相同的查询时，查询运行良好，没有任何问题。在我要插入结果的表中， NUM_CURRENT_EMP是 int类型， DISTINCT_EMP是 float。伤了我的头。
任何帮助表示赞赏。

Answer 1

如果用定义别名的表达式替换having中的别名，会发生什么？

having count(distinct c.SERIAL_NBR) >= 25 and
       count(distinct c.SERIAL_NBR)/count(distinct a.SERIAL_NBR) > 0.01