CREATE TABLE salaryByMonth (  employeeNo varchar2(20),  yearMonth varchar2(6),  salary number ) ; insert into SALARYBYMONTH (EMPLOYEENO, YEARMONTH, SALARY) values (1, '200805', 500); insert into SALARYBYMONTH (EMPLOYEENO, YEARMONTH, SALARY) values (1, '200802', 150); insert into SALARYBYMONTH (EMPLOYEENO, YEARMONTH, SALARY) values (1, '200803', 200); insert into SALARYBYMONTH (EMPLOYEENO, YEARMONTH, SALARY) values (1, '200804', 300); insert into SALARYBYMONTH (EMPLOYEENO, YEARMONTH, SALARY) values (1, '200708', 100); commit; SELECT EMPLOYEENO       ,YEARMONTH       ,SALARY       ,MIN(SALARY) KEEP(DENSE_RANK FIRST ORDER BY YEARMONTH) OVER(PARTITION BY EMPLOYEENO) FIRST_SALARY -- 基比分析 salary/first_salary       ,LAG(SALARY, 1, 0) OVER(PARTITION BY EMPLOYEENO ORDER BY YEARMONTH) AS PREV_SAL[b]-- 环比分析，与上个月份进行比较 [/b]      ,LAG(SALARY, 12, 0) OVER(PARTITION BY EMPLOYEENO ORDER BY YEARMONTH) AS PREV_12_SAL[b]-- 同比分析，与上个年度相同月份进行比较    [/b]      ,SUM(SALARY) OVER(PARTITION BY EMPLOYEENO, SUBSTR(YEARMONTH, 1, 4) ORDER BY YEARMONTH RANGE UNBOUNDED PRECEDING) LJ --累计值   FROM SALARYBYMONTH  ORDER BY EMPLOYEENO          ,YEARMONTH