您不需要aDISTINCT即可获得结果；此外，要获得给定顺序的结果，您所需要做的只是一个ORDER BY子句：
select trim(regexp_substr('bbb;aaa;qqq;ccc','[^;]+', 1,level) ) as q
from dual
connect by regexp_substr('bbb;aaa;qqq;ccc', '[^;]+', 1, level) is not null
order by level
使用regexp_substr在Oracle中拆分字符串
使用regexp_substr在Oracle中拆分字符串
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