比如我有DS1、DS2两个数据集,用关联数据集合并在一起,要如何写条件呢DS1:select a,b,c FROM A where 1=1${if(len(sys) == 0,""," and 系统 in ('" + sys + "')")}AND A.申请日期 >= '${rq1}'AND A.申请日期 <= '${rq2}'DS2:select a,b,c FROM B where 1=1${if(len(sys) == 0,""," and 系统 in ('" + sys + "')")}AND A.申请日期 >= '${rq1}'AND A.申请日期 <= '${rq2}'