SQL 分组查询

需求

• 原始语句
• oracle根据COMPANY_CODE，FEE_TYPE分组，根据year和month倒序排序， 获得每一组的第一条数据

SELECT COMPANY_CODE,
             YEAR,
             MONTH,
             FEE_TYPE,
             DAILY_FEE,
             to_number(to_char(LAST_DAY(to_date(year || SUBSTR(MONTH, -2), 'yyyyMM')), 'dd')) as MONTH_DAYS
      from V_REAL_COST_FEE_MIX
      where COMPANY_CODE = 2100
       AND LAST_DAY(TO_DATE(year || '-' || SUBSTR(month, -2) || '-01', 'YYYY-MM-DD')) < TO_DATE('2023-02-26', 'YYYY-MM-DD')
      order by YEAR desc,
               MONTH desc