Question

I have this linq Query in a C# project

       var query = from p in db.Posts
                    join a in db.Author on p.Author equals a
                    join u in db.Users on p.PostedBy equals u
                    where p.IsActive.Equals(true)
                    orderby p.PostedDate descending
                    select new ViewModel
                    {
                        ...
                    };

If I move where p.IsActive.Equals(true) near from p in db.Posts, like

       var query = from p in db.Posts
                    where p.IsActive.Equals(true) //Moved
                    join a in db.Author on p.Author equals a
                    join u in db.Users on p.PostedBy equals u
                    orderby p.PostedDate descending
                    select new ViewModel
                    {
                        ...
                    };

will it make any difference to the performance of the query?

Answer 1

I’m not sure that it will work if you’ll do it, but if you are using it against a SQL database it should not make any difference. Both queries will be translated to the SQL like this one:

SELECT ...
FROM Posts INNER JOIN Author ON ... INNER JOIN Users ON ...
WHERE Posts.IsActive = true
...