CREATE TABLE professor (dept_code VARCHAR)
CREATE TABLE department (dept_code VARCHAR, dept_name VARCHAR)

How many professors who are from either Accounting or Biology department?
SELECT COUNT(*) FROM professor AS T1 JOIN department AS T2 ON T1.dept_code = T2.dept_code WHERE T2.dept_name = 'Accounting' OR T2.dept_name = 'Biology'
SELECT COUNT(*) FROM "professor" AS "T1" JOIN "department" AS "T2" ON "T1"."dept_code" = "T2"."dept_code" AND ("T2"."dept_name" = 'Accounting' OR "T2"."dept_name" = 'Biology')