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Oracle 1z1-071 Exam Syllabus Topics:

Section	Objectives
Data Manipulation and Schema Objects	- DDL operations 1. CREATE, ALTER, DROP tables and constraints - DML operations 1. INSERT, UPDATE, DELETE, MERGE
SQL Functions	- Single-row functions 1. Character, numeric, date functions - Conversion and conditional functions 1. TO_CHAR, TO_NUMBER, CASE expressions
Subqueries and Advanced SQL	- Correlated subqueries and nested queries - Single-row and multi-row subqueries
SQL Retrieval	- SELECT statements and filtering data 1. WHERE clause and conditions 2. ORDER BY and row limiting - Joins and set operations 1. INNER, OUTER, CROSS joins 2. UNION, INTERSECT, MINUS
Relational Database Concepts	- Tables, rows, columns, and relational model basics - Data types and database objects overview

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Oracle Database SQL Sample Questions (Q276-Q281):

NEW QUESTION # 276
Which three are true about multitable INSERTstatements? (Choose three.)

A. They can be performed on remote tables.
B. They can be performed on relational tables.
C. They can insert each computed row into more than one table.
D. They can be performed only by using a subquery.
E. They can be performed on external tables using SQL* Loader.
F. They can be performed on views.

Answer: B,C,E

NEW QUESTION # 277
View the exhibits and examine the structures of the COSTSand PROMOTIONStables.

Evaluate the following SQL statement:

What would be the outcome of the above SQL statement?

A. It displays prod IDs in the promos which cost less than the highest cost in the same time interval.
B. It displays prod IDs in the promo with the lowest cost.
C. It displays prod IDs in the promos with the lowest cost in the same time interval.
D. It displays prod IDs in the promos with the highest cost in the same time interval.

Answer: A

NEW QUESTION # 278
Examine the description of the EMPLOYEES table:

Which statement will execute successfully, returning distinct employees with non-null first names?

A. SELECT DISTINCT * FROM employees WHERE first_name IS NOT NULL;
B. SELECT first_name, DISTINCT last_name FROM employees WHERE first_name <> NULL;
C. SELECT DISTINCT * FROM employees WHERE first_name <> NULL;
D. SELECT first_name, DISTINCT last_name FROM employees WHERE first_name IS NOT NULL;

Answer: B

NEW QUESTION # 279
Examine this SQL statement:

Which two are true? (Choose two.)

A. The subquery is not a correlated subquery.
B. The subquery is executed for every row in the EMPLOYEEStable.
C. All existing rows in the EMPLOYEEStable are deleted.
D. The DELETE statement executes successfully even if the subquery selects multiple rows.
E. The subquery is executed before the DELETEstatement is executed.

Answer: B,E

NEW QUESTION # 280
Examine the description of the EMPLOYEES table:

Which two queries return rows for employees whose manager works in a different department?

A. SELECT emp.*
FROM employees emp
LEFT JOIN employees mgr
ON emp.manager_ id = mgr.employee_ id
AND emp. department id < > mgr. department_ id;
B. SELECT emp.*
FROM employees emp
WHERE NOT EXISTS (
SELECT NULL
FROM employees mgr
WHERE emp.manager id = mgr.employee_ id
AND emp.department_id<>mgr.department_id
);
C. SELECT emp. *
FROM employees emp
JOIN employees mgr
ON emp. manager_ id = mgr. employee_ id
AND emp. department_ id<> mgr.department_ id;
D. SELECT emp. *
FROM employees emp
RIGHT JOIN employees mgr
ON emp.manager_ id = mgr. employee id
AND emp. department id <> mgr.department_ id
WHERE emp. employee_ id IS NOT NULL;
E. SELECT emp. *
FROM employees emp
WHERE manager_ id NOT IN (
SELECT mgr.employee_ id
FROM employees mgr
WHERE emp. department_ id < > mgr.department_ id
);

Answer: B,C

Explanation:
To find employees whose manager works in a different department, you can use a subquery or a join that compares the DEPARTMENT_ID of the employee with the DEPARTMENT_ID of their manager.
A . This query is incorrect because the NOT IN subquery incorrectly attempts to compare EMPLOYEE_ID with MANAGER_ID, and the correlation condition inside the subquery is incorrect.
B . This query is correct. The NOT EXISTS clause correctly identifies employees whose MANAGER_ID matches the EMPLOYEE_ID of another employee (mgr) and where the DEPARTMENT_ID differs from that manager's DEPARTMENT_ID.
C . This query is incorrect because the LEFT JOIN will return all employees, and there is no WHERE clause to filter out those employees whose managers are in the same department.
D . This query is incorrect. The RIGHT JOIN does not ensure that the resulting rows are for employees whose manager works in a different department. It also returns all managers, which is not the requirement.
E . This query is correct. The JOIN ensures that the returned rows are for employees (emp) whose MANAGER_ID matches the EMPLOYEE_ID of managers (mgr), and it correctly filters to include only those employees whose DEPARTMENT_ID is different from their manager's DEPARTMENT_ID.
Reference:
Oracle Documentation on Joins: https://docs.oracle.com/database/121/SQLRF/queries006.htm#SQLRF52358

NEW QUESTION # 281
......

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