Is a C# Query needed to use the set operations?

When I was searching for a way to get the difference between two lists I came across this page: Set operations (C#).

I found out, that I can use the Except method. But what confused me in this code example:

string[] planets1 = { "Mercury", "Venus", "Earth", "Jupiter" };
string[] planets2 = { "Mercury", "Earth", "Mars", "Jupiter" };

IEnumerable<string> query = from planet in planets1.Except(planets2)
                            select planet;

foreach (var str in query)
{
    Console.WriteLine(str);
}

/* This code produces the following output:
 *
 * Venus
 */

was this line: IEnumerable<string> query = from planet in planets1.Except(planets2) select planet;

Considering that I’m very new to C#, my question is, do you need this query to use the Except method? This line seems to do the same thing: IEnumerable<string> query = planets1.Except(planets2);

Am I missing something here?

You can write LINQ in two way

1. query expression like form

   IEnumerable<string> query = from planet in planets1.Except(planets2)
                                select planet;
   

2. Method chain form

   IEnumerable<string> query = planets1.Except(planets2)
                                    .Select(planet => planet);
   

In query expression form, group clause or select clause must exists but in method chain form you do not need to end with select method.

So both of these code return IEnumerable<string[]>

planets1.Except(planets2)

and

planets1.Except(planets2).Select(planet => planet)