WITH RECURSIVE CategoryTree("id", "categoryName", "prevId", "level") AS (
  SELECT public."productCategories"."id", public."productCategories"."categoryName", public."productCategories"."prevId", 1 AS level
    FROM public."productCategories"

  WHERE id = 13

  UNION ALL

  select categories."id", categories."categoryName", categories."prevId", categoryTree."level" + 1
    FROM public."productCategories" categories
      JOIN categoryTree ON categories."id" = categoryTree."prevId"
)

SELECT array_to_string(array_agg(distinct "id"), '/') as "categoryTreeId", string_agg("categoryName", '/') as "categoryTreeName"
   FROM (
    SELECT "id", "categoryName", "level"
      FROM categoryTree
      ORDER BY "level" DESC
    ) as result
;