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Blog71.9K views804 votes0 replies2,440 following

Loading one-to-many collections with joinedload can duplicate parent rows. Learn when to use selectinload and how to verify the SQL.

sqlalchemyTasadduq Burneyowner35.3K rep · 03 Mar 2026, 11:58 UTC

Guide85.2K views966 votes1 reply1 comment3,743 following

A decision guide for SQLAlchemy ORM loading strategies in paginated endpoints, explaining why selectinload prevents N+1 queries and row duplication.