SQLμμ UNION μ°μ°μλ λ κ° μ΄μμ SELECT λ¬Έμ κ²°κ³Όλ₯Ό νλμ μ§ν©μΌλ‘ κ²°ν©νλ λ° μ¬μ©λ©λλ€. κ° SELECT λ¬Έμ κ²°κ³Όλ λμνλ νλμ μ΄λ¦κ³Ό νμ μ΄ κ°μμΌ ν©λλ€. # μμ 쿼리 SELECT employee_id, first_name, last_name FROM employees WHERE department_id = 1 UNION SELECT employee_id, first_name, last_name FROM employees WHERE department_id = 2; μ΄ μμ μλ employees ν μ΄λΈμμ employee_id, first_name λ° last_name μ΄μ μ νν©λλ€. 첫 λ²μ§Έ SELECT λ¬Έμ department_id 1μ μ§μλ§ μ ννκ³ , λ λ²μ§Έ S..