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DECLARE
V_EXT_DES VARCHAR2(1000) := '\u4eba\u4fe1\u7528';
V_SQL VARCHAR2(100);
TEXT_BUFFER VARCHAR2(100);
BEGIN
V_SQL := 'select unistr(REPLACE(''' || V_EXT_DES ||
''',''\u'',''\'')) from dual ';
EXECUTE IMMEDIATE V_SQL
INTO TEXT_BUFFER;
DBMS_OUTPUT.PUT_LINE(TEXT_BUFFER);
END;
/