Is there a way to measure string similarity in Google BigQuery

Question

I\'m wondering if anyone knows of a way to measure string similarity in BigQuery.

Seems like would be a neat function to have.

My case is i need to compare

Answer 1

Below is quite simpler version for Hamming Distance by using WITH OFFSET instead of ROW_NUMBER() OVER()

#standardSQL
WITH Input AS (
  SELECT 'abcdef' AS strings UNION ALL
  SELECT 'defdef' UNION ALL
  SELECT '1bcdef' UNION ALL
  SELECT '1bcde4' UNION ALL
  SELECT '123de4' UNION ALL
  SELECT 'abc123'
)
SELECT 'abcdef' AS target, strings, 
  (SELECT COUNT(1) 
    FROM UNNEST(SPLIT('abcdef', '')) a WITH OFFSET x
    JOIN UNNEST(SPLIT(strings, '')) b WITH OFFSET y
    ON x = y AND a != b) hamming_distance
FROM Input