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Supported SQL Statements and Extensions for the Salesforce Driver : Select : From Clause : Join in a From Clause
  
Join in a From Clause
Purpose
Associates multiple tables within a Select statement. Joins may be either explicit or implicit.
Example A
This is the example from the previous section restated as an explicit inner join:
SELECT e.name, d.deptName
FROM emp e INNER JOIN dep d ON e.deptId = d.id;
FROM table_name {RIGHT OUTER | INNER | LEFT OUTER | CROSS} JOIN table.key ON search-condition
Example B
In this example, two tables are joined using LEFT OUTER JOIN. T1, the first table named includes nonmatching rows.
SELECT * FROM T1 LEFT OUTER JOIN T2 ON T1.key = T2.key
If you use a CROSS JOIN, no ON expression is allowed for the join.