语法
LAST_DAY 传入一个日期类型的变量，但会给你一个当月的最后一天的变量
LAST_DAY(TO_DATE(year || '-' || SUBSTR(month, -2) || '-01', 'YYYY-MM-DD')) <= ?
应用实例
AssetValueSingleQT.spl
一个表中只存储的年和月，需要更具年月筛选小于指定日期，并且最新的一条记录
selectCOMPANY_CODE,YEAR,MONTH,FEE_TYPE,DAILY_FEE,MONTH_DAYS,DAILY_FEE * MONTH_DAYS as MONTH_FEE
from (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_DAYSfrom SAP_FINANCE_FEE_MIX_MONTHwhere COMPANY_CODE = ?AND FEE_TYPE = ?AND LAST_DAY(TO_DATE(year || '-' || SUBSTR(month, -2) || '-01', 'YYYY-MM-DD')) <= TO_DATE(?, 'YYYY-MM-DD')order by YEAR desc,MONTH desc) day_fee
where ROWNUM = 1
)
