Select users belonging only to particular departments

Question

I have the following table with two fields namely a and b as shown below:

create table employe
(
    empID varchar(10),
    department varchar(10)
);
         


        

Answer 1

I know that this question has already been answered, but it was a fun problem to do and I tried to do it in a way that no one else has. Benefits of mine is that you can input any list of strings as long as each value has a comma afterwards and you don't have to worry about checking counts.

Note: Values must be listed in alphabetic order.

XML Solution with CROSS APPLY

select DISTINCT empID
FROM employe A
CROSS APPLY
            (
                SELECT department + ','
                FROM employe B
                WHERE A.empID = B.empID
                ORDER BY department
                FOR XML PATH ('')
            ) CA(Deps)
WHERE deps = 'Y,Z,'

Results:

empID
----------
A103