How do I select a single column in Entity Framework?

You could use the LINQ select clause and reference the property that relates to your Name column. Show activity on this post. If you’re fetching a single item only then, you need use select before your FirstOrDefault()/SingleOrDefault(). And you can use anonymous object of the required properties.

Can joins be used for a single table?

Noting that joins can be applied over more than two tables. To apply join between two tables, one table must contain a column that is a reference for the other table. In the example above, the Employees table must have a column that contain a reference key for the department (ex: Department id).

How do I join a table in EF core?

Entity Framework Core Joining In SQL, a JOIN clause is used to combine rows from two or more tables, based on a related column between them. In Entity Framework Core you can use the Join() and GroupJoin() method to achieve the same results. The following query joins Customers and Invoices table using the Join() method.

What is the difference between first () and take 1 in LINQ?

First will query Take 1, so there is no difference in query. Calling FirstOrDefault will be one step statement, because Take returns IEnumerable do you will need to call First anyway. First will throw exception so FirstOrDefault is always preferred.

How do I ignore a column in Entity Framework?

  1. How to ignore a property when using Entity Framework Code First.
  2. Exclude a field/property from the database with Entity Framework 4 & Code-First.
  3. Exclude certain column from Entity Framework select statment.
  4. Entity Framework Ignore property by conventions.
  5. Custom properties in partial class (Invalid column name)

How do I choose which join to use in SQL?

In two sets:

  1. Use a full outer join when you want all the results from both sets.
  2. Use an inner join when you want only the results that appear in both sets.

How can we get data from multiple tables in Entity Framework in MVC?

Working With Multiple Tables in MVC Using Entity Framework

  1. Introduction.
  2. Click File -> New -> Project.
  3. Expand the Installed templates then expand Visual C# then expand Web then select Visual Studio 2012 then select ASP.NET MVC 4 Web Application as a new project.

What is difference between FirstOrDefault and SingleOrDefault in Linq?

FirstOrDefault() – Same as First(), but not thrown any exception or return null when there is no result. Single() asserts that one and only one element exists in the sequence. First() simply gives you the first one.