oracle 中,对指定的列值重复,只显示第一个值,其余列保持不变,要如何实...答:通过脚本来实现,比较直观容易理解。declare v_a char(1):='0';v_b char(1):='0';v_aa char(1):='';v_bb char(1):='';cursor c1 is select A,B,C,D from TAB order by A,B,C,D;v c1%rowtype;begin open c1;loop fetch c1 into v;exit when c1%notfound;if v_a=v....