需求:一串字母'ADFGH',需要按照顺序来显示:A D F G H 第一步:先把字符串拆分 with test as( select 'ADFGH' as a from dual ) select a ,substr(a,level,1) from test connect by level<=length(a) 第二步:用listagg拼接 with test as( select 'ADFGH' as a from dual ) select a ,(select listagg(subs