You can use special operators to aggregate and combine data.
In addition to the data available within the database, you can query remote or heterogeneous data using linked servers.
You will then create a simple query to list customers who are located in London.
Your computer might show different names or locations for some of the Visual Studio user interface elements in the following instructions. Linq is not listed as a reference in your project (expand the References node in Solution Explorer), add it, as explained in the following steps.The main types of constraints in SQL are check, unique, not null, and primary constraints.Check constraints are used to make certain that a statement about the data is true for all rows in a table.You also declare a In this step, you create a query to find which customers in the database Customers table are located in London. For more information, see Introduction to LINQ Queries (C#).The query code in this step just describes the query. You will also produce a log output to show the SQL commands that LINQ to SQL generates.