Left outer join in Entity Framework

This evening I heard someone say that Left Outer Joins are not possible in Entity Framework or perhaps Left Outer Joins are possible, but they bring in all the data and then filter out the right table.

I felt an urge to argue, but I resisted. I thought I would investigate before I waste time. I came up with some articles pretty quickly.

  1. Left Outer Join in LINQ
  2. Left Outer Join using Inverse Navigation Property
  3. DefiningQuery Element
  4. Left Outer Join in LINQ to SQL
  5. LINQ to Entities with Multiple Left Outer Joins

I am sure these should resolve all questions related to Left Outer Joins.

Now about the performance and the question about how the data is brought, I am pretty sure we can prove that LINQ Queries all support deferred execution. But we can always prove that using the SQL Query Profiler.

Hope this helps.

Published Wednesday, August 19, 2009 2:04 AM by Nilotpal Das

Comments

Tuesday, February 23, 2010 2:55 PM by brad

# re: Left outer join in Entity Framework

Too bad none of these examples even work. LinqToEntities doesn't support .DefaultIfNull()

Friday, February 18, 2011 11:03 PM by Katherine Stepman

# re: Left outer join in Entity Framework

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Monday, February 28, 2011 1:54 AM by Brandy Swingfield

# re: Left outer join in Entity Framework

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Saturday, March 05, 2011 8:43 AM by Natasha Smith

# re: Left outer join in Entity Framework

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Friday, March 18, 2011 12:20 PM by Whitny Karver

# re: Left outer join in Entity Framework

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Friday, March 25, 2011 6:03 PM by Mary Meetington

# re: Left outer join in Entity Framework

It was rather interesting for me to read the article. Thanks for it. I like such topics and everything that is connected to this matter. I would like to read a bit more soon.        

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