The CData JDBC Driver for Google Ads supports standard SQL joins like the following examples.

Inner Join

An inner join selects only rows from both tables that match the join condition:

SELECT CampaignPerformance.CampaignName, CampaignPerformance.Amount, ClickPerformance.Page FROM CampaignPerformance, ClickPerformance WHERE CampaignPerformance.CampaignId=ClickPerformance.CampaignId

Left Join

A left join selects all rows in the FROM table and only matching rows in the JOIN table:

SELECT CampaignPerformance.CampaignName, CampaignPerformance.Amount, ClickPerformance.Page FROM CampaignPerformance LEFT OUTER JOIN ClickPerformance ON CampaignPerformance.CampaignId=ClickPerformance.CampaignId