From what I see a CTE is just an expression that you can reference.

In C#, if you did something like this

var seniorMales = from user in users where u.Age > 65 && u.Sex == “male” select u

seniorMales is just an IQueryable<User>

Later on you could say

var gaMales = seniorMales.Where(s => s.State == “GA”)

var floridaMale = seniorMales.Where(s => s.State ==“Florida”)

All three of those are just expressions that have not hit the database yet.

Then when you want to actually run the query and limit the number of rows, you can do

var result = floridaMales.Limit(20).ToList()

It would then create a query including a limit clause just as you would expect it to.

Now if you do

floridaMales.ToList().Limit(10)

It would return all of the rows in the table to the client and it would be limited on the client side (don’t do that).

Worse case, if LINQ can’t express in query syntax, a provider can add its own extensions in function syntax and the provider can still parse the expression tree.