Oracle 将逗号分隔的列转行

需求：按ID，把PARTICIPATORS字段里的内容按‘，’ 分开，转成行

select id,PARTICIPATORS from
(with test as (select id ,PARTICIPATORS  from NSC_OA_RW  where PARTICIPATORS is not null )
    select id,substr(t.cPARTICIPATORS,instr(t.cPARTICIPATORS, ',', 1, c.lv) + 1,
    instr(t.cPARTICIPATORS, ',', 1, c.lv + 1) - (instr(t.cPARTICIPATORS, ',', 1, c.lv) + 1)) AS PARTICIPATORS
  from 
    (select id,',' || PARTICIPATORS || ',' AS cPARTICIPATORS,length(PARTICIPATORS || ',') - nvl(length(REPLACE(PARTICIPATORS, ',')), 0) AS cnt FROM test) t,
    (select LEVEL lv from dual CONNECT BY LEVEL <= 100) c where c.lv <= t.cnt )

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