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The WITH clause may be processed as an inline view or resolved as a temporary table. The advantage of the latter is that repeated references to the subquery may be more efficient as the data is easily retrieved from the temporary table, rather than being requeried by each reference.
WITH dept_count AS (
SELECT deptno, COUNT(*) AS dept_count
GROUP BY deptno)
SELECT e.ename AS employee_name,
dc.dept_count AS emp_dept_count
FROM emp e,
WHERE e.deptno = dc.deptno;
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Answer / krishna
Specifies whether to send a request to the database using
an SQL WITH clause. When set to Yes, and if the database
supports WITH clauses, a WITH clause request is generated.
When set to No, or if the database does not support WITH
clauses, a request using derived tables is generated
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