根据SQL分类的原则，假如有如下SQL语句：1:SELECT salary*1.5 FROM employees WHERE job_id ='PU_CLERK';2:SELECT salary*2 FROM employees WHERE job_id='SA_MAN';3:SELECT employee_id FROM department WHERE department_name = 'HR';4:SELECT department_id FROM employees WHERE salary <5000;5:SELECT sum(salary) FROM employees WHERE job_id ='PU_CLERK';6:SELECT max(salary) FROM employees WHERE job_id='PU_CLERK';那么按照分类码，DBFirewall看到的分析SQL，由三级到一级如下呈现：?SELECT FROM WHERE = SELECT FROM WHERE = SELECT SALARY*0 FROM EMPLOYEES WHERE JOB_ID='#' SELECT EMPLOYEE_ID FROM DEPARTMENT WHERE DEPARTMENT_NAME='#' SELECT SUM FROM WHERE = SELECT SUM(SALARY) FROM EMPLOYEES WHERE JOB_ID='#‘ SELECT MIN FROM WHERE = SELECT MIN(SALARY) FROM EMPLOYEES WHERE JOB_ID='#‘ SELECT DEPARTMENT_ID FROM EMPLOYEES WHERE SALARY<0 SELECT MIN FROM WHERE
