SQL 使用 max() 进行多个内连接以获取最新记录的条目

Question

尝试使用 INNER JOIN 构建 SQL。 INNER JOIN 工作正常，现在我需要添加 MAX() 函数以将行限制为最近的行。添加了此 INNER JOIN client_diagnosis_record ON SELECT cr.PATID、cr.date_of_diagnosis、cr.most_recent_diagnosis... 收到这个 SQL 代码错误，需要一些帮助，我确信这是一个简单的疏忽，但我的眼睛因为看得太久而变得模糊......

语法错误:[SQLCODE: <-4>:

SQLCODE: <-4>:<A term expected, beginning with one of the following: identifier, constant, aggregate, %ALPHAUP, %EXACT, %MVR, %SQLSTRING, %

[%msg: < The SELECT list of the subquery


SELECT pd.patient_name,
       cr.PATID,
       cr.date_of_diagnosis,
       cr.EPISODE_NUMBER,
       ce.diagnosing_clinician_value, 
       ce.data_entry_user_name,
       most_recent_diagnosis
FROM client_diagnosis_record cr 
INNER JOIN patient_current_demographics pd ON cr.patid = pd.patid 
INNER JOIN client_diagnosis_entry ce ON ce.patid = pd.patid
                                    AND cr.ID = ce.DiagnosisRecord
INNER JOIN client_diagnosis_record ON (SELECT cr.PATID,
                                              cr.date_of_diagnosis,
                                              cr.most_recent_diagnosis
                                       FROM ( SELECT patid,
                                                     date_of_diagnosis,
                                                     MAX(ID) AS most_recent_diagnosis
                                              FROM client_diagnosis_record) cr
 INNER JOIN RADplus_users ru ON ru.staff_member_id = ce.diagnosing_clinician_code
 WHERE cr.PATID <> '1'
 AND ce.diagnosis_status_value ='Active'
 AND (ru.user_description LIKE '%SOA' OR ru.user_description LIKE '%OA')
 GROUP BY cr.PATID

Answer 1

我尝试重新格式化您的查询，但您的查询语法似乎不正确。您可以尝试以下查询 -

SELECT pd.patient_name,
       cr.PATID,
       cr.date_of_diagnosis,
       cr.EPISODE_NUMBER,
       ce.diagnosing_clinician_value, 
       ce.data_entry_user_name,
       most_recent_diagnosis
FROM client_diagnosis_record cr
INNER JOIN (SELECT patid,
                   date_of_diagnosis,
                   MAX(ID) AS most_recent_diagnosis
            FROM client_diagnosis_record
            GROUP BY patid,
                     date_of_diagnosis) cr2 ON cr.PATID = cr2.PATID
                                            AND cr.date_of_diagnosis = cr2.date_of_diagnosis
                                            AND cr.ID = cr2.most_recent_diagnosis
INNER JOIN patient_current_demographics pd ON cr.patid = pd.patid 
INNER JOIN client_diagnosis_entry ce ON ce.patid = pd.patid
                                    AND cr.ID = ce.DiagnosisRecord
INNER JOIN RADplus_users ru ON ru.staff_member_id = ce.diagnosing_clinician_code
WHERE cr.PATID <> '1'
AND ce.diagnosis_status_value ='Active'
AND (ru.user_description LIKE '%SOA' OR ru.user_description LIKE '%OA')
GROUP BY cr.PATID