Question

On large tables in MSSQL; selecting specific columns results in greater speed of the query. Does the same apply to Linq to SQL?

Would this:

var person = from p in [DataContextObject].Persons              where p.PersonsID == 1              select new { p.PersonsID, p.PersonsAdress, p.PersonsZipcode }; 

be faster than this:

var person = from p in [DataContextObject].Persons              where p.PersonsID == 1              select p; 

… ?

Answer 1

I highly recommend LinqPad. It is free and lets you run LINQ queries dynamically. When you can also look at the SQL that is generated.

What you will see is that the LINQ query will translate the first query into selecting only those columns. So it is faster.