在 Bigquery 中连接多个表

Question

I have over 100 tables in my BQ, but i would like to create a single table with all the tables.

How is this possible? Now i am using the below query to export data manually by table.

SELECT 
date as Date,
SUM(totals.visits) as TotalVisits
From
[1243.ga_sessions_20160425]
Group by date
order by date

I also would like to add alias to each table so that i would know from which table the data came from.

please let me know thanks

Answer 1

The way to union tables in BQ is by using table wildcard functions. your query should look something like: (If you share your data-set, we can verify the suggested query)

SELECT 
    date as Date,
    SUM(totals.visits) as TotalVisits
    From
    TABLE_QUERY(1243,'table_id contains"ga_sessions_"')
    Group by date
    order by date