Consider the following input:

ID          PrevID
-------- ---------
33          NULL
272       33
317        272
318        317

I need to somehow get the following result:

Result
--------
/33
/33/272
/33/272/317
/33/272/317/318

I need to do this in SQL and if REALLY not possible, then anything else goes, and Databricks does not support recursive CTE's so I am out of ideas, i have an SQL Fiddle here that illustrates the recursivce CTE way that doesn't work on databricks: http://sqlfiddle.com/#!18/101df/3/0

Any help is appreciated, thanks