OpenSAFELY ehrQL documentation
Explanation
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    GitHub
    GitHub
    • ehrQL
    • Tutorial
      • Setting up
      • Working with data with ehrQL
      • Simple transformations
      • More complex transformations
      • Building a dataset
      • Using ehrQL as part of a study
      • Quiz
    • How-to guides
      • Using ehrQL to answer specific questions
      • How to include and exclude patients from your study population
      • Resolving ehrQL errors
      • How to use dummy data in an ehrQL dataset definition
      • How to use dummy data in an ehrQL measures definition
      • How to assign multiple columns to a dataset programmatically
      • How to work with codelists
      • How to test your dataset definition
    • Reference
      • Language reference
      • Language features
      • Backends
      • Table schemas
      • Command line interface
      • Cheatsheet
      • Upgrading ehrQL from v0 to v1
    • Explanation
      • ehrQL backend tables
      • ehrQL output formats
      • Using ehrQL in OpenSAFELY projects
      • Running ehrQL
      • Using the measures framework
      • Selecting populations for study
      • The OpenSAFELY VS Code extension

    Explanation

    The explanation provides background knowledge for studying ehrQL.

    • ehrQL backend tables
    • ehrQL output formats
    • Using ehrQL in OpenSAFELY projects
    • Running ehrQL
    • Using the measures framework
    • Selecting populations for study
    • The OpenSAFELY VS Code extension
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    Upgrading ehrQL from v0 to v1
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    ehrQL backend tables
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