MySQL Selecteer slechts één rij van elke gediagnosticeerde patiënt volgens de eerste datum

Ik denk dat je het eerste bezoek en de laatste diabetesbeoordeling wilt. Ik ben ervan uitgegaan dat het eerste veld in al je tabellen een auto_increment-veld is en dat consult_id in de viool onjuist is getypt.

Gezien het bovenstaande

MariaDB [sandbox]> select p.patient_name_en,v.*,c.diagnosis_id,d.diagnosis_name,da.date_of_assessment,da.assessment_result
    -> from visit v
    -> join patient p on p.patient_id = v.patient_id
    -> join consultation c on c.patient_id = v.patient_id and c.visit_id = v.visit_id
    -> join diagnosis d on d.diagnosis_id = c.diagnosis_id
    -> left join
    -> (
    -> select da.patient_id, da.date_of_assessment,da.assessment_result
    -> from diabetes_assessment da
    -> where da.diabetes_assessment_id  = (select max(da1.diabetes_assessment_id) from diabetes_assessment da1 where da1.patient_id = da.patient_id)
    -> ) da on da.patient_id = v.patient_id
    -> where v.visit_id = (select min(visit_id) from consultation c where c.patient_id = v.patient_id)
    -> and c.diagnosis_id in (1,2)
    -> and v.clinic_id = 361
    -> ;
+-----------------+----------+------------+-----------+---------------+--------------+--------------+---------------------------------------------+--------------------+-------------------+
| patient_name_en | visit_id | patient_id | clinic_id | date_of_visit | visit_status | diagnosis_id | diagnosis_name                              | date_of_assessment | assessment_result |
+-----------------+----------+------------+-----------+---------------+--------------+--------------+---------------------------------------------+--------------------+-------------------+
| ABC             |        1 | 361-9001   |       361 | 2017-03-03    | Active       |            1 | Diabetes mellitus with diabetic nephropathy | 2017-05-05         |             40.00 |
| XYZ             |        3 | 361-0361   |       361 | 2017-10-03    | Active       |            2 | E01 Diabetes mellitus with kidney disease   | 2017-03-10         |             30.50 |
+-----------------+----------+------------+-----------+---------------+--------------+--------------+---------------------------------------------+--------------------+-------------------+
2 rows in set (0.00 sec)