can I denormalize multiple large tables in bigquer

问题:

Can I denormalize (by joining) multiple large tables in bigquery?

Table1 is 400M rows Table2 is 2M rows Table3 is 800K rows

If not, do I have to do it in my relational database before I upload? That would be a difficult solution.

Should I chunk the tables into smaller pieces and run iterations of joins over the tables so that it is always large to small? This would also be a difficult solution.

Thank you.

回答1:

BigQuery now supports "Big JOINs" which allows you skip the LIMIT's in your JOIN queries.

Docs here: https://developers.google.com/bigquery/docs/query-reference#joins

回答2:

Yes you can make new tables based on query results.

Try to look here:

https://developers.google.com/bigquery/docs/queries

and here:

https://developers.google.com/bigquery/docs/tables#addmoredata