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SQL Statements and Extensions for the Salesforce Driver : Subqueries : IN Predicate
  
IN Predicate
Purpose
The In predicate specifies a set of values against which to compare a result set. If the values are being compared against a subquery, only a single column result set is returned.
Syntax
value [NOT] IN (value1, value2,...)
OR
value [NOT] IN (subquery)
Example
SELECT * FROM emp WHERE deptno IN
(SELECT deptno FROM dept WHERE dname <> 'Sales')