The CData JDBC Driver for Smartsheet 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 Sheet_Customers.ContactName, Sheet_Orders.OrderDate FROM Sheet_Customers, Sheet_Orders WHERE Sheet_Customers.CustomerId=Sheet_Orders.CustomerId

Left Join

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

SELECT Sheet_Customers.ContactName, Sheet_Orders.OrderDate FROM Sheet_Customers LEFT OUTER JOIN Sheet_Orders ON Sheet_Customers.CustomerId=Orders.CustomerId