PREVIEW: Prescribing of disposable insulin devices

Below are the database queries which are used to create this measure. These are run against a copy of the BSA prescribing data which we store in Google BigQuery. We're working on making our BigQuery tables publicly available at which point it will be possible to run and modify these queries yourself. But even where code and database queries are not directly useable by others we believe it is always preferable to make them public.

Description Prescribing of disposable insulin devices as percentage of all insulin prescribing
Why it matters
Tags
Implies cost savings No
History View change history on GitHub →

Numerator SQL

SELECT
     CAST(month AS DATE) AS month,
     practice AS practice_id,
     SUM(items) AS numerator
 FROM hscic.normalised_prescribing p INNER JOIN dmd.vmp v --this joins data table to dm+d vmp table 
 ON CONCAT(SUBSTR(p.bnf_code,0,9),SUBSTR(p.bnf_code,-2)) = CONCAT(SUBSTR(v.bnf_code,0,9),SUBSTR(v.bnf_code,-2)) --joins both brand and generics to vmp table 
 INNER JOIN dmd.vtm t --this joins VMP table to VTM table 
 ON v.vtm = t.id INNER JOIN dmd.unitofmeasure u --this joins to unit of measure table to get device details 
 ON v.unit_dose_uom = u.cd
 WHERE lOWER(t.nm) LIKE '%insulin%' -- filters to any insulin 
 and LOWER(u.descr) = 'pre-filled disposable injection' -- filters to disposable pens
 GROUP BY month, practice_id

Denominator SQL

SELECT
     CAST(month AS DATE) AS month,
     practice AS practice_id,
     SUM(items) AS denominator
 FROM hscic.normalised_prescribing p INNER JOIN dmd.vmp v --this joins data table to dm+d vmp table 
 ON CONCAT(SUBSTR(p.bnf_code,0,9),SUBSTR(p.bnf_code,-2)) = CONCAT(SUBSTR(v.bnf_code,0,9),SUBSTR(v.bnf_code,-2)) --joins both brand and generics to vmp table 
 INNER JOIN dmd.vtm t --this joins VMP table to VTM table 
 ON v.vtm = t.id INNER JOIN dmd.unitofmeasure u --this joins to unit of measure table to get device details 
 ON v.unit_dose_uom = u.cd
 WHERE lOWER(t.nm) LIKE '%insulin%' -- filters to any insulin 
 and LOWER(u.descr) IN('pre-filled disposable injection', 'cartridge') -- filters to disposable pens and catridges
 GROUP BY month, practice_id
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