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

Below will work with BigQuery Standard SQL

SELECT 
  (SELECT params.value.int_value FROM x.params 
                                 WHERE params.key = 'level_id') AS level_id,
  (SELECT params.value.int_value FROM x.params 
                                 WHERE params.key = 'count') AS count
FROM `com_company_appname_ANDROID.app_events_20161210`, UNNEST(event_dim) AS x
WHERE x.name  = 'level_replays_until_first_victory'

See also Migrating from legacy SQL in case if you are stuck with Legacy SQL

Answer 2

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<STRUCT<key STRING, value STRUCT<string_value STRING, int_value INT64, float_value FLOAT64, double_value FLOAT64 >>>) AS (
  (SELECT x.value FROM UNNEST(params) x WHERE x.key=k)
);

#UDF for user properties
CREATE TEMP FUNCTION propertyValueByKey(k STRING, properties ARRAY<STRUCT<key STRING, value STRUCT<value STRUCT<string_value STRING, int_value INT64, float_value FLOAT64, double_value FLOAT64>, 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;

Answer 3

I love the previous solution! Here is an alternative solution for the same problem I came up with. I'd welcome comments on which solution is more efficient/cheaper and why.

SELECT event_param1.value.int_value AS level_id, 
event_param2.value.int_value AS count
FROM `com_company_appname_ANDROID.app_events_20161210`,
UNNEST(event_dim) event,
UNNEST(event.params) as event_param1,
UNNEST(event.params) as event_param2
WHERE event.name = 'level_replays_until_first_victory'
AND event_param1.key = 'level_id'
AND event_param2.key = 'count'