数据库计算日期，统计 系统时间（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)