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Query Design & Read Models

Projection, related data, read models, pagination, dynamic filters, query shape, and efficient set-based work.

15 drillsPractice one at a timeOrdered pathComparison questionConcept questionDebugging scenarioArchitecture scenario

Recommended start

Projections vs Entities

Explains EF Core projections into DTOs with practical .NET data-access examples and production trade-offs.

Medium~7 minStep 1 of 15

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1Projections vs EntitiesRecommended startExplains EF Core projections into DTOs with practical .NET data-access examples and production trade-offs.Comparison questionMedium~7 min.NETC#EF CorePractice 2Include vs SelectExplains `Include` versus `Select` in EF Core with practical .NET data-access examples and production trade-offs.Comparison questionMedium~7 min.NETC#EF CorePractice 3N+1 QueriesExplains N+1 queries in EF Core with practical .NET data-access examples and production trade-offs.Concept questionMedium~7 min.NETC#EF CorePractice 4Split vs Single QueryExplains split queries versus single joined queries with practical .NET data-access examples and production trade-offs.Comparison questionHard~9 min.NETC#EF CorePractice 5SQL JoinsExplains SQL joins for API response shapes with practical .NET data-access examples and production trade-offs.Concept questionMedium~7 min.NETC#EF CorePractice 6Offset vs CursorExplains offset versus cursor pagination with practical .NET data-access examples and production trade-offs.Comparison questionHard~9 min.NETC#EF CorePractice 7Generated SQLExplains how to inspect EF Core generated SQL and connect LINQ shape to database execution behavior.Concept questionMedium~7 min.NETASP.NET CoreEF CorePractice 8EF N Plus OneDiagnoses hidden per-row EF Core queries and replaces them with a bounded query shape without creating an oversized join.Debugging scenarioMedium~10 min.NETASP.NET CoreEF CorePractice 9Read ModelsExplains read models for complex API screens with practical .NET data-access examples and production trade-offs.Architecture scenarioHard~12 min.NETC#EF CorePractice 10DTO ProjectionExplains EF Core projections for API read models that need related names, counts, and summaries without loading full graphs.Concept questionMedium~7 min.NETASP.NET CoreEF CorePractice 11Dynamic FiltersExplains composing dynamic LINQ filters while keeping query execution in SQL and index-friendly.Concept questionMedium~7 min.NETASP.NET CoreEF CorePractice 12EF Keyset PaginationExplains stable EF Core pagination using cursor predicates, deterministic ordering, and index-aligned queries.Concept questionMedium~7 min.NETASP.NET CoreEF CorePractice 13Compiled QueriesExplains when EF Core compiled queries help, what they do not fix, and how to measure their value.Concept questionMedium~7 min.NETASP.NET CoreEF CorePractice 14Filtered IncludeExplains filtered Include in EF Core with practical .NET data-access examples and production trade-offs.Concept questionMedium~7 min.NETC#EF CorePractice 15ExecuteUpdateExplains when set-based EF Core updates are better than loading entities and where lifecycle behavior can differ.Concept questionMedium~7 min.NETASP.NET CoreEF CorePractice

Practice order

15 drillsOne at a time

1Projections vs EntitiesUp next / Medium / ~7 min
2Include vs SelectMedium / ~7 min
3N+1 QueriesMedium / ~7 min
4Split vs Single QueryHard / ~9 min
5SQL JoinsMedium / ~7 min
6Offset vs CursorHard / ~9 min
7Generated SQLMedium / ~7 min
8EF N Plus OneMedium / ~10 min

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