SQL
W3Resource - SQL Hospital Database - Exercises, Practice, Solution
Large practice site with some content for a "hospital" database, not relate to actual EHR structure but a relevant practice resource.
Coursera - Clinical Data Models and Data Quality - Course focused on OMOP standard terminology
Have not used it first hand, the available content seems useful for both OMOP overview and ties to SQL queries
https://intro-sql-fh.netlify.app/
Great course shared by the incomparable Ted Laras for intro to SQL concepts
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