CREATE TABLE employees (id VARCHAR(255), first_name VARCHAR(255), last_name VARCHAR(255)); CREATE TABLE customers (support_rep_id VARCHAR(255))
How many customers does Steve Johnson support?
    
SQL: SELECT COUNT(*) FROM employees AS T1 JOIN customers AS T2 ON T2.support_rep_id = T1.id WHERE T1.first_name = "Steve" AND T1.last_name = "Johnson"