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Question ID 8051

Which three statements about subqueries are true? (Choose three.)

Option A

A main query can have more than one subquery.

Option B

A subquery can have more than one main query.

Option C

The subquery and main query must retrieve data from the same table.

Option D

The subquery and main query can retrieve data from different tables.

Option E

Only one column or expression can be compared between the subquery and main query.

Option F

Multiple columns or expression can be compared between the subquery and main query.

Correct Answer ADE
Explanation Explanation: D not C: A subquery does not have to retrieve data from the same table


Question ID 8052

Evaluate this SQL statement: SELECT e.emp_name, d.dept_name FROM employees e JOIN departments d USING (department_id) WHERE d.department_id NOT IN (10,40) ORSER BY dept_name; The statement fails when executed. Which change fixes the error?

Option A

remove the ORDER BY clause

Option B

remove the table alias prefix from the WHERE clause

Option C

remove the table alias from the SELECT clause

Option D

prefix the column in the USING clause with the table alias

Option E

prefix the column in the ORDER BY clause with the table alias

Option F

replace the condition "d.department_id NOT IN (10,40)" in the WHERE clause with "d.department_id <> 10 AND d.department_id <> 40"

Correct Answer CE
Explanation

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