Comments on: Linq to SQL, aggregates and empty results

By: sshow

sshow — Fri, 19 Feb 2010 12:54:19 +0000

Thanks for the post! It helped me alot, I did not know that IQueryable.DefaultIfEmpty() was not supported by LinqToSql

By: Peter

Peter — Mon, 15 Feb 2010 20:47:20 +0000

does this work with a relationship such as…

var result = (from v in db.Table select (int?)v.Table2.IntColumn).Max() ?? 0;

If Table2 has no results

By: Billy

Billy — Mon, 30 Nov 2009 11:57:56 +0000

Thanks couldnt figure this out.

By: Matt Slay

Matt Slay — Wed, 28 Oct 2009 02:01:00 +0000

Thanks. This post quickly helped me with the same problem. However, I could not get the DefaultIfEmpty() suggested by Fil to work. It gave some error like: “Could not format node ‘OptionalValue’ for execution as SQL.” I was working against a LinqToSql context, maybe that is why. However, the original solution in the blog post worked just fine. I then had to test the return value for null, and I was fine.

By: Fil Mackay

Fil Mackay — Sun, 18 Oct 2009 12:07:21 +0000

A better solution is this, as it does’t interfere with the type:

var result = (from v in db.Table select vIntColumn).DefaultIfEmpty().Max();

By: Sam

Sam — Wed, 16 Sep 2009 16:46:54 +0000

Only the third or fourth time I’ve looked this up. I’ll be back again as soon as I forget why I need this.
Thank you.

By: Rishit

Rishit — Tue, 28 Apr 2009 09:50:21 +0000

Thanks a lot…Was searching for the result since long time

By: Serge

Serge — Fri, 14 Nov 2008 09:56:55 +0000

You have my gratitude as well!
I actually tried everything but your solution.

By: Giulliano Bueno

Giulliano Bueno — Wed, 11 Jun 2008 00:50:51 +0000

Dude,

Thank you so much you have just saved my time. Probably i would be spending few hours in some problem very similar to yours.