Question

我有一个工作查询，它给了我maxdate：

SELECT a.client_id AS client_id
   , a.patientcount AS patientcount
   , received_date AS maxRecDate
FROM
(
   SELECT DISTINCT CLIENT_ID
   , PATIENT_ID
   , count(*) over (partition by client_id, patient_id) AS patientcount
   from f_accession_daily
) AS a
JOIN F_ACCESSION_DAILY AS f ON a.CLIENT_ID = f.CLIENT_ID
   AND a.PATIENT_ID = f.PATIENT_ID
GROUP BY f.RECEIVED_DATE, a.CLIENT_ID, a.patientcount
HAVING f.RECEIVED_DATE = MAX(f.received_date)

在同一个查询中，我还想返回min（f.received_date）。

有办法做到这一点吗？也许是子查询？

Answer 1

我可能会遗漏某些内容，但我不明白为什么要按f.RECEIVED_DATE

进行分组

我认为查询可能是：

SELECT a.client_id AS client_id
   , a.patientcount AS patientcount
   , max(f.received_date) AS maxRecDate
   , min(f.received_date) AS minRecDate
FROM
(
   SELECT DISTINCT CLIENT_ID
   , PATIENT_ID
   , count(*) over (partition by client_id, patient_id) AS patientcount
   from f_accession_daily
) AS a
JOIN F_ACCESSION_DAILY AS f ON a.CLIENT_ID = f.CLIENT_ID
   AND a.PATIENT_ID = f.PATIENT_ID
GROUP BY a.CLIENT_ID, a.patientcount

我没有对此进行测试，但我认为它应该可行。

Answer 2

在查询中，添加OR条件以检查MIN日期。解决问题

SELECT a.client_id AS client_id
, a.patientcount AS patientcount
, received_date AS maxRecDate
FROM
(
SELECT DISTINCT CLIENT_ID
, PATIENT_ID
, count(*) over (partition by client_id, patient_id) AS patientcount
from f_accession_daily
) AS a
JOIN F_ACCESSION_DAILY AS f ON a.CLIENT_ID = f.CLIENT_ID
AND a.PATIENT_ID = f.PATIENT_ID
GROUP BY f.RECEIVED_DATE, a.CLIENT_ID, a.patientcount
HAVING f.RECEIVED_DATE = MAX(f.received_date) 
OR f.RECEIVED_DATE = MIN(f.received_date) -- Newly added condition

在同一查询中获取最小和最大日期

2 个答案: