Finding Data that’s in One Table but not Another

I have an employee table with a field empno (employee number) and an hours table that contains all time that is worked by all employees.The hours table has the empno field also. What I am trying to do is get a list of inactive employees; that is, all employees that haven’t any entries in the hours table. Is there a simple way to do this?

Sure. Try something like this:

SELECT empno FROM Employees     WHERE empno NOT IN (SELECT empno FROM Hours);

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