Procedimento armazenado e cursor do Oracle

INSERT INTO temp 
SELECT esd, 
       'E' 
FROM   test_data_sovlp 
WHERE  esd IS NOT NULL 
  UNION ALL 
SELECT td, 
       CASE is_db 
         WHEN 0 THEN 'S' 
         WHEN 1 THEN 'H' 
       END AS FLAG 
FROM   test_data_sovlp 
WHERE  td IS NOT NULL