Add `exists_for_patient_on` helper for `practice_registrations`

opensafely-core / ehrql

ehrQL: the electronic health record query language for OpenSAFELY

https://docs.opensafely.org/ehrql/

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Add `exists_for_patient_on` helper for `practice_registrations` #2234

Closed rw251 closed 5 days ago

rw251 commented 6 days ago

practice_registrations.for_patient_on(date).exists_for_patient() is a common filter when defining a cohort. Simplifying this to practice_registrations.exists_for_patient_on(date).

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rw251 commented 5 days ago

closes #2232