In a scenario where you need to aggregate data from multiple tables, how would you construct an efficient projection query in Entity Framework?
- Apply lazy loading with Virtual keyword to defer loading of related entities until accessed directly in the code.
- Execute a raw SQL query with joins to fetch the required data and then map it to entity objects using custom mappings.
- Use eager loading with Include to fetch related entities and then filter the data using LINQ queries.
- Utilize the Select method to specify only the necessary columns and perform any necessary transformations.
When aggregating data from multiple tables, using the Select method with LINQ allows us to specify exactly which columns we need, reducing the data transferred from the database and improving performance. Eager loading with Include would fetch more data than necessary, potentially increasing memory usage. Lazy loading could lead to performance issues due to multiple database calls. Executing raw SQL queries should be avoided for maintainability and security reasons.
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