计算日期,统计时间(月)的数据
 
计算出本月第一天到最后一天的日期:
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select  date(rtrim(char(year(min(start_time))))||'-'||rtrim(char(month(min(start_time))))||'-1') as startTime,
 
date(rtrim(char(year(max(start_time))))||'-'||rtrim(char(month(max(start_time)+1 month)))||'-1') as endTime from table_A   t;
 
统计本月数据:
select sum(MONTHLY_REPAYMENTS) as totle from TABLE_A   where ID='123'  
AND  date('2012-11-01') <  date(current timestamp  )  and  date('2012-12-01') > date(current timestamp)