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Library/Backend/Python
Medium Pro#python

N+1 Query là gì và cách khắc phục trong SQLAlchemy?

February 15, 2026

Quick summary

The N+1 query problem is a performance issue where an ORM executes 1 parent query and N child queries due to Lazy Loading. In SQLAlchemy, this is resolved using Eager Loading via `joinedload` (for To-One relationships) and `selectinload` (for To-Many relationships).

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Sample answer:

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Quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore.

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