The xBase Adapter 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 a.Name, o.CloseDate FROM Accounts a, Opportunities o WHERE a.Id = o.AccountId

Left Join

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

SELECT a.Name, c.FirstName, c.LastName FROM Accounts a LEFT JOIN Contacts c ON a.Id = c.AccountId