T-SQL: Comparing Two Tables - Records that don't exist in second table

Question

If UNION ALL is an addition in T-SQL. What is the equivalent of subtraction?

For example, if I have a table PEOPLE and a table

Answer 1

Unfortunately there is a problem in your design. instead of having two table PEOPLE and CONTRACTOR. You should have a table PEOPLE and another Table TYPE (if some people can have several role another table maybe needed). In your PEOPLE table you make a referece to the TYPE table.

then you requests become

SELECT * from PEOPLE, TYPE
WHERE PEOPLE.type_id = TYPE.id 
AND TYPE.name = 'CONTRACTOR'

SELECT * from PEOPLE, TYPE
WHERE PEOPLE.type_id = TYPE.id 
AND TYPE.name = 'EMPLOYEE'

(untested)