Moderate EF Core Question 25 of 215

How do you avoid the N+1 query problem?

.NET / C# · Speak this in 60–90 seconds · Faridabad & Delhi NCR

Without indexScan every row

With indexJump to keys

CostWrites slower

I Include the navigation I need, or project to an anonymous type or DTO in one Select.

Why interviewers care about EF Core:

This is a process

question about EF Core.

Panels listen for order,

trade-offs, and what you would actually do on a .NET project - not buzzwords.

Stay structured

Name the idea, why it exists, then one short example.

Close cleanly

End with when you use it and one common pitfall.

Before you speak the answer, walk the interviewer through these steps:

1
I Include the navigation
I need, or project to an anonymous type or DTO in one Select.
2
Lazy loading that fires
a query per row is the usual N+1.
3
Logging SQL in development
is how I catch it.
4
Give an example
One tiny concrete case you can say aloud.
5
Common mistake
What juniors usually get wrong.
6
Close
When you pick this over the alternative.

Here's a short line you can speak, broken into clear beats:

Say this line

“Lazy loading that fires a query per row is the usual N+1.”

Break into beats

Lazyloadingthatfiresaquery

Speaking order

2987408337471632900

Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.

I Include the navigation I need, or project to an anonymous type or DTO in one Select. Lazy loading that fires a query per row is the usual N+1.