what is an NULL???

Question

how to use select query in SQL server?

Deepak Tewatia · Answer

It seems there might be a misunderstanding—your query appears to focus on SQL server and the usage of select queries, which is not directly related to .NET Core technology. However, I can guide you on how to handle NULL values within .NET Core when retrieving data from a SQL Server database. In .NET Core, when querying a SQL Server database, you may encounter NULL values. These represent the absence of a value in a database column. When handling NULL values in .NET Core, it's crucial to ensure proper null-checking and handling to avoid potential runtime errors. You can use conditional statements or the null-coalescing operator to handle NULL values effectively. For example, if you're querying a database using Entity Framework Core in .NET Core, you can handle NULL values as shown in the following code snippet: var result = dbContext.Products .Where(p => p.CategoryId == categoryId) .Select(p => new { ProductName = p.ProductName ?? "No Name Available", UnitPrice = p.UnitPrice ?? 0.0m }) .ToList(); In this example, the null-coalescing operator (`??`) is used to provide default values for the ProductName and UnitPrice properties if they are NULL in the database. If you have specific queries related to .NET Core and NULL values, please feel free to share, and I'd be glad to provide further assistance within the scope of .NET Core technology.