Reverse String Word by Word using SQL

Question

I would need to reverse the word positions in a sentence or String.

For example : \"Hello World! I Love StackOverflow\", to be displayed as \"StackOverflow          


        

Answer 1

Here you go:

WITH sel_string AS 
      (SELECT 'Hello World! I Love StackOverflow' AS fullstring FROM DUAL)
  SELECT SUBSTR(fullstring, beg + 1, end_p - beg - 1) AS token
    FROM (SELECT beg, LEAD(beg) OVER (ORDER BY beg) AS end_p, fullstring
            FROM (SELECT beg, fullstring
                    FROM (SELECT LEVEL beg, fullstring
                            FROM sel_string
                            CONNECT BY LEVEL <= LENGTH(fullstring))
                    WHERE INSTR(' ', SUBSTR(fullstring, beg, 1)) > 0
                  UNION ALL
                    SELECT 0, fullstring FROM sel_string
                  UNION ALL
                    SELECT LENGTH(fullstring) + 1, fullstring FROM sel_string))
    WHERE end_p IS NOT NULL AND
          end_p > beg + 1
    ORDER BY ROWNUM DESC;

All in one SQL query. I wish I could claim credit for this query but I can't - found it years ago on the net and have used it ever since.

Share and enjoy.