"case" in SQL

UPDATE inventory SET price = price *
 CASE
   WHEN quantity > 20 THEN 0.75
   WHEN quantity BETWEEN 10 AND 20 THEN 0.90
   ELSE 0.95
   END;

SELECT employee_name
 CASE admin
   WHEN 1 THEN 'yes'
   ELSE 'no'
   END 'admin'
FROM employees;