Querying Multiple Tables in Big Query

Querying multiple tables in Big Query

One SQL query can reference multiple tables. Just separate each table with a comma in the FROM clause to query across all mentioned tables.

Joining multiple tables in bigquery

I think you are looking for something like below

SELECT
  t1.field1 AS field1,
  t2.field2 AS field2,
  t1.field3 AS field3,
  t3.field4 AS field4
FROM [datasetName.tableA] t1
JOIN [datasetName.tableB] t2 ON t1.somefield = t2.anotherfield
JOIN [datasetName.tableC] t3 ON t1.somefield = t3.yetanotherfield

Bigquery how to query multiple tables of the same structure?

Take a look at the table wildcard functions section of the BigQuery query reference. TABLE_DATE_RANGE or TABLE_QUERY will work for you here. Something like:

SELECT column
FROM TABLE_DATE_RANGE(xx.ga_sessions_,
                      TIMESTAMP('2014-10-19'),
                      TIMESTAMP('2014-10-21'))
WHERE column = 'condition';

Can you create multiple tables with one query in Google Big query?

As per the documentation link in your question:

Only one CREATE statement is allowed.

So, looks like you cannot. Maybe someone else has a trick/workaround, but I'm not aware of any.

Joining Two Tables with Big Query Connected to Google Sheets

Yes, It is possible in BigQuery or any other Databases. Just read about join.

Query will look like

select  t11.Account, t11.Geo , t11.sum_data1, t11.sum_data2, t12.sum_expense1, t12.sum_expense2
from
(   
    select t1.Account, t1.Geo , sum(t1.Data1) sum_data1, sum(t1.Data2) sum_data2
    from table1 t1  
    group by t1.Account, t1.Geo) t11
inner join (    
    select t2.Account, t2.Geo , sum(t2.Expense1) sum_expense1, sum(t2.Expense2) sum_expense2
    from table2 t2  
    group by t2.Account, t2.Geo) t12
on t11.Account = t12.Account 
and t11.Geo = t12.Geo

There can be many variant of joins based on your requirement:

1. INNER : If you are sure all account geo combination are present in both tables.
2. FULL OUTER : If you both table have entries of account, geo which are not present in other table.
3. LEFT OUTER : If you want table1 to be driving table and don't want to miss any record of that even account + geo doesn't exist in table2.
4. RIGHT OUTER : Same as above but driving table will be table2.

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