BigQuery check for array overlap

Question

So I\'m writing a BigQuery query and basically just need to be able to check if any of a number of strings are present as elements in one of the columns of the table, where the

Answer 1

Below are two examples.

First assuming you have your strings in another table strings

#standardSQL
WITH yourTable AS (
  SELECT 1 AS id, ['abc', 'def', 'xyz'] AS column UNION ALL
  SELECT 2, ['123', '456', '789'] UNION ALL
  SELECT 3, ['135', '246', '369'] 
),
strings AS (
  SELECT 'abc' AS str UNION ALL
  SELECT '123' UNION ALL
  SELECT '456'
)
SELECT *
FROM yourTable
WHERE (SELECT COUNT(1) FROM UNNEST(column) AS col JOIN strings ON col = str) > 0  

You can add below to SELECT list if you need to see how many strings are matching

(SELECT COUNT(1) FROM UNNEST(column) AS col JOIN strings ON col = str) AS cnt

Second example assumes you have list of strings packed in Array

#standardSQL
WITH yourTable AS (
  SELECT 1 AS id, ['abc', 'def', 'xyz'] AS column UNION ALL
  SELECT 2, ['123', '456', '789'] UNION ALL
  SELECT 3, ['135', '246', '369'] 
),
strings AS (
  SELECT ['abc', 'def', '456'] AS strs
)
SELECT yourTable.*
FROM yourTable, strings
WHERE (SELECT COUNT(1) FROM UNNEST(column) AS col JOIN UNNEST(strs) AS str ON col = str) > 0   

Same as in first example - you can add below to SELECT list to see matches count

(SELECT COUNT(1) FROM UNNEST(column) AS col JOIN UNNEST(strs) AS str ON col = str) AS cnt