sql - ORA-00976: 此处不允许 LEVEL、PRIOR 或 ROWNUM

Question

我在左连接中使用 LEVEL。我收到了这个错误：

ORA-00976: 此处不允许 LEVEL、PRIOR 或 ROWNUM

我搜索的所有地方都说删除级别，但我无法删除级别。哪里允许水平？

SELECT t1.report_id, coalesce(t1.field_desc, t2.field_desc, 'None') field_desc
FROM dual
LEFT JOIN v_my_view t1
ON t1.priority= 1
AND t1.field_id  NOT IN (
  (SELECT to_number( regexp_substr(
  (SELECT value FROM table WHERE KEY='property'
  ),'[^,]+',1,level ) )
FROM dual
  CONNECT BY to_number( regexp_substr(
  (SELECT value FROM table WHERE KEY='property'
  ),'[^,]+',1,level )) IS NOT NULL
) )
LEFT JOIN  v_my_view  t2
ON t1.report_id = t2.report_id
AND t1.priority= 2;