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N+1 Select Problem & Solution

Why N+1 queries happen and how JOIN FETCH solves it.

Anuj Kumar Singh Written by Anuj Kumar Singh (Lead Engineer, 13+ yrs exp) 5 min read Verified Spring Boot 3+ Guide
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N+1 Select Problem

Occurs when fetching 1 parent requires N additional SQL calls. Solved via `JOIN FETCH` or `@EntityGraph`.