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Oracle Database SQL Sample Questions (Q312-Q317):

NEW QUESTION # 312
View the Exhibit and examine the structure of the EMPLOYEES and JOB_HISTORY tables.

Examine this query which must select the employee IDs of all the employees who have held the job SA_MAN at any time during their employment.
SELECT EMPLOYEE_ID
FROM EMPLOYEES
WHERE JOB_ID = 'SA_MAN'
-------------------------------------
SELECT EMPLOYEE_ID
FROM JOB_HISTORY
WHERE JOB_ID = 'SA_MAN';
Choose two correct SET operators which would cause the query to return the desired result.

A. MINUS
B. UNION ALL
C. UNION
D. INTERSECT

Answer: B,C

Explanation:
Explanation/Reference:

NEW QUESTION # 313
View the exhibit and examine the data in ORDERS_MASTER and MONTHLY_ORDERS tables.

Evaluate the following MERGE statement:
MERGE_INTO orders_master o
USING monthly_orders m
ON (o.order_id = m.order_id)
WHEN MATCHED THEN
UPDATE SET o.order_total = m.order_total
DELETE WHERE (m.order_total IS NULL)
WHEN NOT MATCHED THEN
INSERT VALUES (m.order_id, m.order_total);
What would be the outcome of the above statement?

A. The ORDERS_MASTER table would contain the ORDER_IDs 1, 2, 3 and 4.
B. The ORDERS_MASTER table would contain the ORDER_IDs 1, 2 and 3.
C. The ORDERS_MASTER table would contain the ORDER_IDs 1 and 2.
D. The ORDERS_MASTER table would contain the ORDER_IDs 1, 2 and 4.

Answer: D

Explanation:
Explanation
References:
https://docs.oracle.com/cd/B28359_01/server.111/b28286/statements_9016.htm

NEW QUESTION # 314
Examine the description of the PROMOTIONStable:

You want to display the unique promotion costs in each promotion category.
Which two queries can be used? (Choose two.)
SELECT DISTINCT promo_category || ' has ' || promo_cost AS COSTS FROM

A. SELECT DISTINCT promo_cost ||' in '|| DISTINCT promo_category FROM promotions
B.
C. SELECT promo_category, DISTINCT promo_cost FROM promotions ORDER BY 2;
D. ORDER BY 1;
SELECT promo_cost, promo_category FROM promotions ORDER BY 1;
E. promotions ORDER BY 1;
SELECT DISTINCT promo_category, promo_cost FROM promotions ORDER BY 1;

Answer: A,C

NEW QUESTION # 315
Examine the description of the PRODUCTS table:

Which two statements execute without errors?

A. MERGE INTO new_prices n
USING (SELECT * FROM products WHERE cost>150) p
ON (n.prod_id= p.prod_id)
WHEN MATCHED THEN
DELETE WHERE (p.cost<200)
B. MERGE INTO new_prices n
USING products p
ON (p.prod_id =n.prod_id)
WHEN NOT MATCHED THEN
INSERT (n.prod _id, n.price) VALUES (p.prod_id, cost*.01)
WHERE (p.cost<200);
C. MERGE INTO new_prices n
USING (SELECT * FROM products WHERE cost>150) p
ON (n.prod_id= p.prod_id)
WHEN MATCHED THEN
UPDATE SET n.price= p.cost*.01
DELETE WHERE (p.cost<200);
D. MERGE INTO new_prices n
USING (SELECT * FROM products) p
WHEN MATCHED THEN
UPDATE SET n.price= p.cost* 01
WHEN NOT MATCHED THEN
INSERT(n.prod_id, n.price) VALUES(p.prod_id, cost*.01)
WHERE(p.cost<200);

Answer: B,C

NEW QUESTION # 316
Examine the description of the EMPLOYEES table:

Examine this query:

Which line produces an error?

A. Line 5
B. Line 3
C. Line 7
D. Line 8

Answer: B

Explanation:
In the provided SQL query, the issue arises from the alias 'a.avg_sal' which is defined in the subquery but is being referenced in the SELECT list of the outer query. This is not permitted in SQL as the scope of the alias defined in the subquery is only within that subquery.
Here is the breakdown of the code and the error:
* Line 1: Correct syntax for initiating a SELECT statement.
* Line 2: Refers to 'e.salary', which is a correct reference to the 'salary' column using alias 'e' for the employees table.
* Line 3: 'a.avg_sal' attempts to reference an alias that is defined in the subquery within the outer query, which is not allowed. This is because 'avg_sal' is defined in the subquery's SELECT list and cannot be referenced outside of it. The correct way to include the average salary from the subquery in the SELECT list of the main query would be to repeat the subquery or to use a join that includes the average salary.
* Line 5-7: The subquery itself is correctly formed; it computes the average salary for the same department.
* Line 8: The ORDER BY clause is properly referencing 'e.last_name', which is defined in the outer query.
Therefore, the error occurs at Line 3 where 'a.avg_sal' is not a valid reference in the SELECT list of the main query because it is defined in the subquery.
The rules of scope for aliases in subqueries are specified in the Oracle Database SQL Language Reference 12c documentation. Subquery aliases cannot be referenced outside their subquery.

NEW QUESTION # 317
......

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Oracle Database SQL Sample Questions (Q312-Q317):

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