我要查询在2015.4--2016.1月的数据,结果显示了2016.6月份的数据,我的mysql语句出了什么问题吗?帮忙看一下,谢谢statistics_date_month业务月度statistics_date_year 业务年份startmonth开始月份endmonth结束月份${if(len(startmonth) == 0,"","and (statistics_date_month >= '" + startmonth"' and statistics_date_year = '" + startyear + "') or (statistics_date_month < '" + startmonth"' and statistics_date_year > '" + startyear + "') ")}${if(len(endmonth) == 0,"","and ( statistics_date_month <= '" + endmonth"' and statistics_date_year = '" + endyear + "') or ( statistics_date_month > '" + endmonth"' and statistics_date_year < '" + endyear + "')")}