Entity Framework Core Interview Question #67

How can navigation properties be used instead of explicit joins?

LINQ Queries, Filtering, Projection & Query Execution Mid-Level Intermediate

Quick Interview Answer

When EF Core knows a relationship, a query can navigate through reference or collection properties and the provider can translate that navigation into appropriate SQL.

Detailed Explanation

When EF Core knows a relationship, a query can navigate through reference or collection properties and the provider can translate that navigation into appropriate SQL.

This often produces cleaner application code because the query expresses domain relationships instead of manually matching keys.

Navigation-based queries still need performance review; readable LINQ does not guarantee an inexpensive SQL plan.

Code Example

var products = await db.Products
    .Where(p => p.Category.IsActive)
    .Select(p => new
    {
        p.Id,
        p.Name,
        CategoryName = p.Category.Name
    })
    .ToListAsync();