Question

I have two tables in my database. A person and a coach table. The person table contains all the people and if one of the people is a coach his ID will be in the coach table.
I need to find all the people who are not coaches… yet and post them in a list.
I have tried:

var query = from es in gr.people
                            join esh in gr.coaches on es.id equals esh.personID
                            where es.id != esh.personID
                            select es;

And this:

var query = from es in gr.people
                            join esh in gr.coaches on es.id equals esh.personID
                            where es.id != esh.personID && es.id.hasValue
                            select es;

But the last one doesn’t alow the .hasValue. And so far it doesn’t work 🙁
Can anybody help me or give me a hint??

Answer 1

Try:

var result = gr.people.Where(p => !gr.coaches.Any(c => c.personID == p.id));