Which statements are true regarding the usage of the WITH clause in complex correlated subqueries? (Choose all that apply.)
A.
It can be used only with the SELECT clause.
B.
The WITH clause can hold more than one query.
C.
If the query block name and the table name were the same, then the table name would take precedence.
D.
The query name in the WITH clause is visible to other query blocks in the WITH clause as well as to the main query block.
D is wrong.
Wait, for D: (visible to query blocks in the WITH clause as well as to the main query block)
================================================================
WITH
dept_max as ( SELECT d.department_id, max(salary)
FROM departments d JOIN employees j
ON (d.department_id = j.department_id)
GROUP BY d.department_id),
dept_max2 as (select department_id from dept_max),
dept_max3 as (select department_id from dept_max2)
SELECT employee_id, last_name, salary
FROM employees
WHERE (department_id, salary) = ANY (SELECT *
FROM dept_max);
================================================================
C: ORA-32039: recursive WITH clause must have column alias list
A.
It can be used only with the SELECT clause.
B.
The WITH clause can hold more than one query.
D.
The query name in the WITH clause is visible to other query blocks in the WITH clause as well as to the main query block.
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