sql - Combine multiple SELECT FROM on both intraday and app_events tables in BigQuery? -


is there way can combine both of these select statements one? i've tried doing:

from dataset1.app_events_intraday_*, dataset2.app_events_*, unnest (event_dim) event

when run column name event_dim ambiguous i'm not sure why be. how run query on both of these tables without having run 2 unions?

here full query interested: 

with alltables (   select      concat(user_dim.app_info.app_instance_id, ':', user_dim.app_info.app_platform) app,     event.date,     user_dim.app_info.app_instance_id users   `dataset1.app_events_intraday_*`, unnest(event_dim) event   _table_suffix     between '20170405' , '20170405'    union   select      concat(user_dim.app_info.app_instance_id, ':', user_dim.app_info.app_platform) app,     event.date,     user_dim.app_info.app_instance_id users   `dataset2.app_events_*`, unnest(event_dim) event   _table_suffix     between '20170405' , '20170405' )  select    count(distinct(users)) unique,   count(users) total alltables

from dataset1.app_events_intraday_, dataset2.app_events_, unnest (event_dim) event
when run column name event_dim ambiguous i'm not sure why

event_dim ambiguous because filed exists in both app_events_intraday_* , app_events_* tables

how run query on both of these tables without having run 2 unions?

if have both sets of tables in same dataset - able adjust from 

from dataset.app_events_*, unnest (event_dim) event

such dataset.app_events_* pattern cover both sets
in case, though, need adjust clause below 

where substr(_table_suffix, -8) between '20170405' , '20170405'

now - bad news

wildcard limited tables in same dataset!
in case cannot eliminate use of union


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