去掉下划线并转首字母为大写

[sql] 
SQL> select REGEXP_REPLACE(INITCAP('abc_de_fghijkl_mn'), '(\w)[_]', '\1')  
  2    from dual  
  3  /  
   
REGEXP_REPLACE(INITCAP('ABC_DE  
------------------------------  
AbcDeFghijklMn