What is the N+1 problem in EF Core?
PICTURE THIS: HOW TO EXPLAIN IT
IdeaEF
HowWhat happens inside
Why they askShows real use
Simple meaning
Loading a collection then querying each child lazily.
WHY — EF instead of guessing?
Why interviewers care about EF:
EF questions separate people
who only read docs from people who shipped.
Keep it short, concrete,
and tied to .NET work.
Stay structured
Name the idea, why it exists, then one short example.
Close cleanly
End with when you use it and one common pitfall.
STEPS — What happens step by step?
Before you speak the answer, walk the interviewer through these steps:
- 1Loading a collection then
querying each child lazily.
- 2Why it exists
I use Include or projections.
- 3Logs and counters reveal
it quickly.
- 4Give an example
One tiny concrete case you can say aloud.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Say this line
“I use Include or projections.”
Break into beats
IuseIncludeorprojections
Speaking order
298740833747163290
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
Loading a collection then querying each child lazily. I use Include or projections.