Andrew Charlwood
82 lines
2.9 KiB
Markdown
82 lines
2.9 KiB
Markdown
# Data Sources And Join Patterns
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This repo assumes access to the Norfolk and Suffolk Snowflake environment used for medicines optimisation analysis.
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## Core Medicines Sources
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`REPORTING_DATASETS_ICB.SCRATCHPAD."MEDS__UnifiedPrescribingTable"`
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Use this for current prescribing analysis when available. It combines EMIS and TPP prescribing into a single shape with `PersonKey`, `SNOMEDCode`, `DateMedicationStart`, quantity, estimated price, source system, prescribing organisation, and current registered GP.
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`NATIONAL.GPMED."MedicinesDispensedInPrimarycare"`
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Use this for official dispensing activity. It is usually slower to refresh than prescribing but is better aligned to dispensing/payment concepts. Key columns include `ProcessingPeriodDate`, `PatientPseudonym`, `PaiddmdCode`, `PaidBNFCode`, `CostCentreODSCode`, `ItemCount`, `PaidQuantity`, and `TotalPaidGross`.
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`DATA_HUB.DWH."DimMedicineAndDevice"`
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Use this as the medicine reference table. It links SNOMED product codes to BNF, VTM, VMP, product descriptions, routes, strengths, and indicative price fields.
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`DATA_HUB.DWH."DimOrganisationAndSite"`
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Use this for practice names and hierarchy columns such as PCN, Place, Alliance, and INT. For Norfolk/Suffolk practice reports, the common filter is:
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```sql
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WHERE "OrganisationSubType" = 'GP Practice'
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AND "IsSiteActive" = 'Yes'
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AND "IsSiteNorfolkAndSuffolk" = 'Yes'
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AND "SiteCode" = "OrganisationCode"
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```
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`DATA_HUB.DWH."DimPerson"`
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Use this for registered GP, age, demographic fields, and pseudonym-to-person links. For Suffolk-inclusive work, avoid old Norfolk-and-Waveney-only registration filters unless the report is explicitly Norfolk and Waveney only.
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`DATA_HUB.PHM."PrimaryCareClinicalCoding"`
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Use this for clinical coding events. Join on `PatientPseudonym`, then filter by `SNOMEDCode` and `EventDateTime`.
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`DATA_HUB.PHM."ClinicalCodingClusterSnomedCodes"`
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Use maintained clinical coding clusters where possible. This is usually safer than searching SNOMED descriptions with text matching.
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## Common Joins
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Prescribing to medicine:
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```sql
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INNER JOIN DATA_HUB.DWH."DimMedicineAndDevice" med
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ON rx."SNOMEDCode" = med."ProductSnomedCode"
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```
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Prescribing to registered practice:
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```sql
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INNER JOIN DATA_HUB.DWH."DimOrganisationAndSite" gp
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ON rx."CurrentGeneralPractice" = gp."OrganisationCode"
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AND gp."SiteCode" = gp."OrganisationCode"
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```
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Dispensing to medicine:
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```sql
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INNER JOIN DATA_HUB.DWH."DimMedicineAndDevice" med
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ON gpm."PaiddmdCode" = med."ProductSnomedCode"
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```
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Clinical coding to maintained cluster:
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```sql
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INNER JOIN DATA_HUB.PHM."ClinicalCodingClusterSnomedCodes" c
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ON cc."SNOMEDCode" = c."SNOMEDCode"
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AND c."Cluster_ID" = 'REPLACE_WITH_CLUSTER_ID'
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```
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## Choosing The Date Field
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Use `ProcessingPeriodDate` for dispensing.
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Use `DateMedicationStart` for prescribing activity windows.
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Use `DateEventRecorded` as a conservative freshness marker for TPP prescribing extracts when checking whether the latest full month is safe to report.
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