Oracle把逗號分割的字符串轉換為可放入in的條件語句的字符數列

前台傳來的字符串：'589,321'

SELECT
*
FROM TAB_A T1 
WHERE  T1.CODE  IN (

SELECT REGEXP_SUBSTR('589,321','[^,]+', 1, LEVEL) FROM DUAL

CONNECT BY REGEXP_SUBSTR('SMITH,ALLEN,WARD,JONES', '[^,]+', 1, LEVEL) IS NOT NULL

)