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2026-05-12 16:40:03 +01:00
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+/*
+    Baseline vs rolling evaluation template
+    =======================================
+
+    Purpose:
+    Compare a fixed baseline cohort with rolling evaluation periods.
+
+    Typical use:
+    - A medicines optimisation search where the baseline is fixed.
+    - Later periods check whether the same patients still meet criteria.
+    - Output is practice x period, preserving the baseline count.
+
+    Replace medicine_products and the evaluation criteria before use.
+*/
+
+SET BASELINE_START = '2025-04-01';
+SET BASELINE_END = '2025-06-30';
+SET FIRST_EVALUATION_START = '2025-04-01';
+SET EVALUATION_MONTHS = 3;
+SET BNF_PREFIX = 'REPLACE_WITH_BNF_PREFIX';
+
+WITH latest_prescribing_date AS (
+    -- Caps generated periods to data already present in the prescribing table.
+    SELECT MAX("DateMedicationStart")::DATE AS "MaxDate"
+    FROM REPORTING_DATASETS_ICB.SCRATCHPAD."MEDS__UnifiedPrescribingTable"
+    WHERE "DateMedicationStart" <= CURRENT_DATE()
+),
+periods AS (
+    -- Generates candidate month starts; increase ROWCOUNT for longer projects.
+    SELECT
+        ROW_NUMBER() OVER (ORDER BY SEQ4()) AS "PeriodNumber",
+        DATEADD(MONTH, ROW_NUMBER() OVER (ORDER BY SEQ4()) - 1, $FIRST_EVALUATION_START::DATE)::DATE AS "PeriodStartDate"
+    FROM TABLE(GENERATOR(ROWCOUNT => 48))
+),
+evaluation_periods AS (
+    SELECT
+        "PeriodNumber",
+        "PeriodStartDate",
+        LAST_DAY(DATEADD(MONTH, $EVALUATION_MONTHS - 1, "PeriodStartDate"))::DATE AS "PeriodEndDate"
+    FROM periods
+    CROSS JOIN latest_prescribing_date
+    WHERE "PeriodStartDate" <= "MaxDate"
+),
+date_bounds AS (
+    SELECT
+        $BASELINE_START::DATE AS "MinEventDate",
+        GREATEST($BASELINE_END::DATE, COALESCE(MAX("PeriodEndDate"), $BASELINE_END::DATE)) AS "MaxEventDate"
+    FROM evaluation_periods
+),
+practices AS (
+    -- Default to active Norfolk and Suffolk parent GP practices.
+    SELECT DISTINCT
+        "OrganisationCode" AS "PracticeCode",
+        "OrganisationName" AS "PracticeName"
+    FROM DATA_HUB.DWH."DimOrganisationAndSite"
+    WHERE "OrganisationSubType" = 'GP Practice'
+      AND "IsSiteActive" = 'Yes'
+      AND "IsSiteNorfolkAndSuffolk" = 'Yes'
+      AND "SiteCode" = "OrganisationCode"
+),
+medicine_products AS (
+    -- Replace this CTE for VTM, VMP, explicit SNOMED, or cluster-based definitions.
+    SELECT DISTINCT "ProductSnomedCode"
+    FROM DATA_HUB.DWH."DimMedicineAndDevice"
+    WHERE "BNFCode" LIKE $BNF_PREFIX || '%'
+),
+medicine_events AS (
+    -- Pull the smallest event window needed for both baseline and evaluation.
+    SELECT DISTINCT
+        rx."PersonKey",
+        rx."CurrentGeneralPractice" AS "PracticeCode",
+        rx."DateMedicationStart"
+    FROM REPORTING_DATASETS_ICB.SCRATCHPAD."MEDS__UnifiedPrescribingTable" rx
+    CROSS JOIN date_bounds db
+    INNER JOIN medicine_products mp
+        ON rx."SNOMEDCode" = mp."ProductSnomedCode"
+    WHERE rx."PersonKey" IS NOT NULL
+      AND rx."CurrentGeneralPractice" IS NOT NULL
+      AND rx."DateMedicationStart" BETWEEN db."MinEventDate" AND db."MaxEventDate"
+),
+baseline_cohort AS (
+    -- Fixes each patient to the practice recorded during the baseline window.
+    SELECT DISTINCT
+        me."PersonKey",
+        me."PracticeCode"
+    FROM medicine_events me
+    WHERE me."DateMedicationStart" BETWEEN $BASELINE_START AND $BASELINE_END
+),
+baseline_counts AS (
+    SELECT
+        "PracticeCode",
+        COUNT(DISTINCT "PersonKey") AS "BaselineCount"
+    FROM baseline_cohort
+    GROUP BY "PracticeCode"
+),
+practice_periods AS (
+    -- Ensures every active practice returns one row per evaluation period.
+    SELECT
+        p."PracticeCode",
+        p."PracticeName",
+        ep."PeriodNumber",
+        ep."PeriodStartDate",
+        ep."PeriodEndDate"
+    FROM practices p
+    CROSS JOIN evaluation_periods ep
+),
+evaluation_counts AS (
+    SELECT
+        bc."PracticeCode",
+        ep."PeriodNumber",
+        ep."PeriodStartDate",
+        ep."PeriodEndDate",
+        COUNT(DISTINCT me."PersonKey") AS "EvaluationCount"
+    FROM baseline_cohort bc
+    CROSS JOIN evaluation_periods ep
+    LEFT JOIN medicine_events me
+        ON me."PersonKey" = bc."PersonKey"
+       AND me."DateMedicationStart" BETWEEN ep."PeriodStartDate" AND ep."PeriodEndDate"
+    GROUP BY bc."PracticeCode", ep."PeriodNumber", ep."PeriodStartDate", ep."PeriodEndDate"
+)
+SELECT
+    pp."PracticeCode",
+    pp."PracticeName",
+    pp."PeriodNumber",
+    pp."PeriodStartDate",
+    pp."PeriodEndDate",
+    COALESCE(bc."BaselineCount", 0) AS "BaselineCount",
+    COALESCE(ec."EvaluationCount", 0) AS "EvaluationCount",
+    COALESCE(bc."BaselineCount", 0) - COALESCE(ec."EvaluationCount", 0) AS "ReductionFromBaseline"
+FROM practice_periods pp
+LEFT JOIN baseline_counts bc
+    ON pp."PracticeCode" = bc."PracticeCode"
+LEFT JOIN evaluation_counts ec
+    ON pp."PracticeCode" = ec."PracticeCode"
+   AND pp."PeriodNumber" = ec."PeriodNumber"
+ORDER BY
+    pp."PracticeName",
+    pp."PeriodNumber";