How to select multiple custom Firebase event parameters in BigQuery?

Question

I exported Firebase events to BigQuery and now I\'m trying to select two parameters from a certain event. Here is the query for selecting one parameter:

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Answer 1

Another solution I find quite handy is to use User Defined Functions to analyze user properties and event parameters

#Standard-SQL

#UDF for event parameters
CREATE TEMP FUNCTION paramValueByKey(k STRING, params ARRAY>>) AS (
  (SELECT x.value FROM UNNEST(params) x WHERE x.key=k)
);

#UDF for user properties
CREATE TEMP FUNCTION propertyValueByKey(k STRING, properties ARRAY, set_timestamp_usec INT64, index INT64 > >>) AS (
  (SELECT x.value.value FROM UNNEST(properties) x WHERE x.key=k)
);

#Query the sample dataset, unnesting the events and turn 'api_version', 'round' and 'type_of_game' into columns 
SELECT 
  user_dim.user_id,
  event.name,
  propertyValueByKey('api_version', user_dim.user_properties).string_value AS api_version,
 paramValueByKey('round', event.params).int_value as round,
 paramValueByKey('type_of_game', event.params).string_value as type_of_game
FROM `firebase-analytics-sample-data.android_dataset.app_events_20160607`,
UNNEST(event_dim) as event
WHERE event.name = 'round_completed'
LIMIT 10;