BigQuery GROUP_CONCAT and ORDER BY

Question

I am currently using BigQuery and GROUP_CONCAT which works perfectly fine. However, when I try to add a ORDER BY clause to the GROUP_CONCAT statement like I would do in SQL,

Answer 1

Standard SQL mode in BigQuery does support ORDER BY clause within some aggregate functions, including STRING_AGG, for example:

#standardSQL
select string_agg(t.x order by t.y) 
from unnest([struct('a', 5), ('b', 1), ('c', 10)]) t

will result in

b,a,c

Documentation is here: https://cloud.google.com/bigquery/docs/reference/standard-sql/functions-and-operators#using-order-by-with-aggregate-functions