opensafely-core/ehrql

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ehrQL: the electronic health record query language for OpenSAFELY

Stars: 13
Forks: 7
Open beginner issues: 0
Indexed issues: 162
Avg merge: 3d 13h
Merged PRs (30d): 13

Dominant language: Python
License: No license data
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 19, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue

Beginner friendly Everything

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162 open issues indexed

New initiatives in biobank phenotype engineering? Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

opensafely-core/ehrql#2882 · Opened Sep 18, 2026
Gentest failure involving very large numbers Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

opensafely-core/ehrql#2877 · Opened Sep 11, 2026
Support registration history in EMIS queries Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

opensafely-core/ehrql#2874 · Opened Sep 10, 2026
Improve dummy data for practice registrations Open

dummy-data

Difficulty 3/5 1-2 days Newbie friendliness 62/100

opensafely-core/ehrql#2872 · 1 comment · Opened Sep 9, 2026
Investigate how to provide stable patient IDs in EMIS Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

opensafely-core/ehrql#2870 · Opened Sep 7, 2026
Investigate whether we can unpin hypothesis Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

opensafely-core/ehrql#2866 · 1 comment · Opened Sep 3, 2026
Support adding job metadata to SQL queries Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

opensafely-core/ehrql#2861 · Opened Aug 24, 2026
Work out how to support more complex "episode clustering" logic Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

opensafely-core/ehrql#2860 · Opened Aug 21, 2026
Add `bytes` as a type for ehrQL table columns Open

opensafely-core/ehrql#2857 · 1 assignee · Opened Aug 14, 2026
Upgrade to ruff 0.16 Open

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

opensafely-core/ehrql#2852 · Opened Aug 6, 2026
Decide on how to handle 128-bit binary values in `patient_id` for EMISv2 Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

opensafely-core/ehrql#2851 · 2 comments · Opened Aug 6, 2026
(spurious?) generative test failures with ignored errors and a subset of engines Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

opensafely-core/ehrql#2847 · 1 comment · Opened Jul 24, 2026
Potential breaking changes to Event Level Data API Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

opensafely-core/ehrql#2841 · 1 comment · Opened Jul 17, 2026
Extend `emisv2.clinical_events` and `emisv2.medications` to include `consultation_id` Open

opensafely-core/ehrql#2828 · 1 assignee · Opened Jun 11, 2026
Add a warning for long running generative tests in CI Open

Difficulty 3/5 1-2 days Newbie friendliness 70/100

opensafely-core/ehrql#2824 · Opened Jun 4, 2026
Update docs for adding a new dataset/table Open

Difficulty 2/5 1-3 hours Newbie friendliness 58/100

opensafely-core/ehrql#2819 · 2 comments · Opened Jun 2, 2026
Ignore arithmetic overflow errors in generative tests Open

Difficulty 1/5 Under an hour Newbie friendliness 78/100

opensafely-core/ehrql#2818 · 1 comment · Opened Jun 1, 2026
Investigate whether we can introspect TPP build progress Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

opensafely-core/ehrql#2805 · Opened May 15, 2026
Improve measures logging Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

opensafely-core/ehrql#2797 · 1 comment · Opened May 13, 2026
Implement `core.practice_registrations` in EMISv2 backend Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

opensafely-core/ehrql#2794 · Opened May 12, 2026
Floating point mismatch between Trino and SQLite Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

opensafely-core/ehrql#2793 · 2 comments · Opened May 12, 2026
Re-visit emisV2 practice_registrations and addresses tables Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

opensafely-core/ehrql#2789 · Opened May 11, 2026
Add a data check to alert us if the EmisV2 patient table contains duplicate patient IDS Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

opensafely-core/ehrql#2788 · Opened May 11, 2026
Confirm that we are validating Arrow files against the schema in the recommended way Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

opensafely-core/ehrql#2782 · Opened May 6, 2026
Document what is and isn't importable in an ehrQL dataset definition Open

documentation

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

opensafely-core/ehrql#2774 · Opened Apr 28, 2026
Investigate poor performance of some specific queries Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

opensafely-core/ehrql#2764 · 1 comment · Opened Apr 17, 2026
Efficiently handle integer SNOMED codes in EMISv2 Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

opensafely-core/ehrql#2755 · Opened Apr 14, 2026
Support materialized query tables in Trino column type integration tests Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

opensafely-core/ehrql#2754 · 1 comment · Opened Apr 14, 2026
Improve Measures (+ related parameters) documentation Open

Difficulty 3/5 1-2 days Newbie friendliness 70/100

opensafely-core/ehrql#2748 · Opened Apr 9, 2026
Add `NotNull()` dummy data constraints to TPP tables based on database schema report Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

opensafely-core/ehrql#2732 · 1 comment · Opened Apr 1, 2026
Make it easier for users to write "coalesce" expressions (i.e. pick the first non-null value) Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

opensafely-core/ehrql#2714 · Opened Mar 13, 2026
Consider folding SQLRunner into ehrQL Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

opensafely-core/ehrql#2713 · Opened Mar 13, 2026
Arbitrary case-variation in TPP schema report due to case-insensitive collations Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

opensafely-core/ehrql#2704 · Opened Mar 9, 2026
Consider adding a hint to missing file error in `table_from_file()` Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

opensafely-core/ehrql#2697 · Opened Mar 4, 2026
Catch some likely errors from using assurance tests incorrectly Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

opensafely-core/ehrql#2686 · Opened Feb 25, 2026
Raise nicer error from `show()` when missing a dummy data file Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

opensafely-core/ehrql#2675 · Opened Feb 13, 2026
Behaviour of VSCode "erhQL debug" extension is very useful but also confusing Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

opensafely-core/ehrql#2674 · Opened Feb 13, 2026
Investigate moving special case dummy data logic onto the table definitions themselves Open

dummy-data

Difficulty 5/5 Over a week Newbie friendliness 35/100

opensafely-core/ehrql#2663 · 1 comment · Opened Feb 4, 2026
Some ehrQL constructs generate deeply nested query graphs which hit Python recursion limits Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

opensafely-core/ehrql#2662 · 2 comments · Opened Feb 4, 2026
Consider automatically casting ints to floats in a wider range of circumstances Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

opensafely-core/ehrql#2641 · 2 comments · Opened Jan 15, 2026
Determine next steps to validate possible new approach to assurance testing Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

opensafely-core/ehrql#2639 · Opened Jan 15, 2026
Add dummy data workshop to ehrQL docs Open

dummy-data

opensafely-core/ehrql#2629 · 1 assignee · Opened Jan 8, 2026
Dummy data: improve chances of generating an accepted patient by weighting list of possible values Open

dummy-data

Difficulty 5/5 Over a week Newbie friendliness 25/100

opensafely-core/ehrql#2627 · Opened Jan 2, 2026
Prevent users from importing internal ehrQL modules Open

opensafely-core/ehrql#2610 · 1 comment · 1 assignee · Opened Dec 5, 2025
Decide what to do about unintended import behaviour users have started relying on Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

opensafely-core/ehrql#2609 · 1 comment · Opened Dec 3, 2025
Spike: parallelise dummy data generation in Codespaces Open

dummy-data

Difficulty 4/5 3-5 days Newbie friendliness 35/100

opensafely-core/ehrql#2604 · Opened Nov 19, 2025
Create report of how users work with data locally Open

opensafely-core/ehrql#2601 · 1 comment · 1 assignee · Opened Nov 17, 2025
Schema table metadata to enhance dummy data generation Open

dummy-data

Difficulty 5/5 Over a week Newbie friendliness 25/100

opensafely-core/ehrql#2595 · 5 comments · Opened Nov 13, 2025
Consider whether the external studies tests are still relevant Open

Difficulty 5/5 Over a week Newbie friendliness 28/100

opensafely-core/ehrql#2591 · 1 comment · Opened Nov 10, 2025
Build docker images with docker compose Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

opensafely-core/ehrql#2586 · Opened Nov 6, 2025

opensafely-core/ehrql

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