${if(len(date_start)=0,"","and date_key >= '"+tochar(date_start,'yymmdd')+"'")}
我这样写会给报错
帆软么得tochar 函数
${if(len(date_start)=0,"","and date_key >= '"+FORMAT(date_start,'yymmdd')+"'")}
${if(len(date_start)=0,"","and date_key >= tochar('"+date_start+"','yymmdd')")}