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Supported SQL and Extensions : Oracle Eloqua, HubSpot, and Marketo : Select : From Clause : Subquery in a From Clause

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Subquery in a From Clause
Subqueries can be used in the From clause in place of table references (table_name). For example:
SELECT * FROM (SELECT * FROM emp WHERE sal > 10000) new_emp, dept WHERE new_emp.deptno = dept.deptno