How Write outer join in LINQ?

How Write outer join in LINQ?

A left outer join is a join in which each element of the first collection is returned, regardless of whether it has any correlated elements in the second collection. You can use LINQ to perform a left outer join by calling the DefaultIfEmpty method on the results of a group join.

Is LINQ join inner or outer?

One commonly used feature of Language-Integrated Query (LINQ) is the facility to combine two sequences of related data using joins. The standard join operation provides an inner join but with a minor modification can be changed to give a left outer join.

Do we have left join in LINQ?

In LINQ, LEFT JOIN or LEFT OUTER JOIN is used to return all the records or elements from the left side collection and matching the elements from the right side of the collection. In LINQ, to achieve the LEFT Join behavior, it is mandatory to use the “INTO” keyword and “DefaultfEmpty()” method.

How write LINQ query LEFT join?

In LINQ, LEFT JOIN or LEFT OUTER JOIN is used to return all the records or elements from the left side collection and match elements from the right side collection. In LINQ, to achieve LEFT JOIN behavior, it’s mandatory to use the “INTO” keyword and the “DefaultIfEmpty()” method.

What is outer join in SQL?

The FULL OUTER JOIN (aka OUTER JOIN ) is used to return all of the records that have values in either the left or right table. For example, a full outer join of a table of customers and a table of orders might return all customers, including those without any orders, as well as all of the orders.

Does LINQ join Inner join?

In LINQ, an inner join is used to serve a result which contains only those elements from the first data source that appears only one time in the second data source. And if an element of the first data source does not have matching elements, then it will not appear in the result data set.

Can FirstOrDefault return null?

FirstOrDefault returns the default value of a type if no item matches the predicate. For reference types that is null . Thats the reason for the exception.

How does an outer join work?