/*
    Prescribing for a patient pseudonym
    ===================================

    Purpose:
    Pull a concise prescribing history for one pseudonym.

    Use carefully:
    - Do not commit real patient pseudonyms into shared repos.
    - Keep row-level extracts out of git and shared folders unless there is a
      clear information governance basis.
*/

SET START_DATE = '2025-04-01';
SET END_DATE = '2026-03-31';
SET PATIENT_PSEUDONYM = 'REPLACE_WITH_PATIENT_PSEUDONYM';

SELECT DISTINCT
    dp."PersonKey",
    dp."PatientPseudonym",
    gp."OrganisationName" AS "CurrentGeneralPracticeName",
    rx."DateMedicationStart",
    med."ProductDescription",
    med."TherapeuticMoietyName",
    med."BNFCode",
    CAST(rx."Quantity" AS FLOAT) AS "Quantity",
    rx."QuantityUnit",
    rx."Directions",
    rx."IsRepeatPrescription",
    rx."SourceSystem"
FROM REPORTING_DATASETS_ICB.SCRATCHPAD."MEDS__UnifiedPrescribingTable" rx
INNER JOIN DATA_HUB.DWH."DimPerson" dp
    ON rx."PersonKey" = dp."PersonKey"
LEFT JOIN DATA_HUB.DWH."DimMedicineAndDevice" med
    ON rx."SNOMEDCode" = med."ProductSnomedCode"
LEFT JOIN DATA_HUB.DWH."DimOrganisationAndSite" gp
    ON rx."CurrentGeneralPractice" = gp."OrganisationCode"
   AND gp."SiteCode" = gp."OrganisationCode"
WHERE dp."PatientPseudonym" = $PATIENT_PSEUDONYM
  AND rx."DateMedicationStart" BETWEEN $START_DATE AND $END_DATE
ORDER BY rx."DateMedicationStart", med."ProductDescription";