ORACLE 1Z0-071 TRAINING PDF | AUTHORIZED 1Z0-071 TEST DUMPS

Oracle 1z0-071 Training Pdf | Authorized 1z0-071 Test Dumps

Oracle 1z0-071 Training Pdf | Authorized 1z0-071 Test Dumps

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Oracle 1z0-071 Certification Exam is designed to test the skills of candidates in various areas such as SQL fundamentals, data retrieval using SQL, data manipulation, and database design. 1z0-071 exam comprises multiple-choice questions and requires candidates to have a thorough understanding of SQL concepts and Oracle Database management. 1z0-071 Exam is based on the latest version of Oracle Database, which makes it highly relevant for current industry needs.

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Oracle Database SQL Sample Questions (Q14-Q19):

NEW QUESTION # 14
Which four statements are true regarding primary and foreign key constraints and the effect they can have on table data?

  • A. A table can have only one primary key and one foreign key.
  • B. Only the primary key can be defined at the column and table level.
  • C. It is possible for child rows that have a foreign key to be deleted automatically from the child table at the time the parent row is deleted
  • D. A table can have only one primary key but multiple foreign keys.
  • E. Primary key and foreign key constraints can be defined at both the column and table level.
  • F. It is possible for child rows that have a foreign key to remain in the child table at the time the parent row is deleted.
  • G. The foreign key columns and parent table primary key columns must have the same names.

Answer: C,D,E

Explanation:
Primary and foreign key constraints are foundational to relational database design:
* Option A: Incorrect. Both primary and foreign key constraints can be defined at the column or table level.
* Option B: Incorrect. Foreign key columns do not need to have the same names as the corresponding primary key columns in the parent table. They must be of the same data type and size.
* Option C: Incorrect. If a foreign key constraint is enforced without ON DELETE CASCADE, deleting the parent row will either prevent the delete (due to constraint) or require a prior deletion or update of the child rows.
* Option D: Correct. A table can indeed have only one primary key, which uniquely identifies each row, but it can have multiple foreign keys linking to primary keys of different tables.
* Option E: Correct. Both types of keys can be defined at either level, providing flexibility in how constraints are applied and enforced.
* Option F: Incorrect. A table can have multiple foreign keys as stated, each referencing a different parent table.
* Option G: Correct. If the ON DELETE CASCADE option is set for a foreign key, then deleting a parent row will automatically delete the corresponding child rows, maintaining referential integrity.


NEW QUESTION # 15
View the exhibit and examine the structure of the EMPLOYEEStable.

You want to display all employees and their managers having 100 as the MANAGER_ID. You want the output in two columns: the first column would have the LAST_NAMEof the managers and the second column would have LAST_NAMEof the employees.
Which SQL statement would you execute?

  • A. SELECT m.last_name "Manager", e.last_name "Employee"
    FROM employees m JOIN employees e
    ON m.employee_id = e.manager_id
    WHERE m.manager_id = 100;
  • B. SELECT m.last_name "Manager", e.last_name "Employee"
    FROM employees m JOIN employees e
    ON m.employee_id = e.manager_id
    WHERE e.manager_id = 100;
  • C. SELECT m.last_name "Manager", e.last_name "Employee"
    FROM employees m JOIN employees e
    WHERE m.employee_id = e.manager_id and AND e.manager_id = 100
  • D. SELECT m.last_name "Manager", e.last_name "Employee"
    FROM employees m JOIN employees e
    ON e.employee_id = m.manager_id
    WHERE m.manager_id = 100;

Answer: B


NEW QUESTION # 16
Which statements are true regarding the WHERE and HAVING clauses in a SELECT statement?
(Choose all that apply.)

  • A. The aggregate functions and columns used in the HAVING clause must be specified in the SELECT list of the query.
  • B. The HAVING clause can be used with aggregate functions in subqueries.
  • C. The WHERE and HAVING clauses can be used in the same statement only if they are applied to different columns in the table.
  • D. The WHERE clause can be used to exclude rows before dividing them into groups.
  • E. The WHERE clause can be used to exclude rows after dividing them into groups.

Answer: B,D


NEW QUESTION # 17
Which two statements are true regarding the DELETE and TRUNCATE commands?

  • A. DELETE can be used to remove rows from only one table in one statement.
  • B. DELETE can be used to remove rows from multiple tables in one statement.
  • C. DELETE and TRUNCATE can be used for tables that are parents for a child table that has a referential integrity constraint having an ON DELETE rule.
  • D. DELETE can be used to remove rows only for tables that are parents for a child table that has a referential integrity constraint referring to the parent.
  • E. DELETE can be used to remove data from specific columns as well as complete rows.

Answer: A,C


NEW QUESTION # 18
Examine the structure of the MEMBERS table: (Choose the best answer.)

Examine the SQL statement:
SQL > SELECT city, last_name LNAME FROM MEMBERS ORDER BY 1, LNAME DESC; What would be the result execution?

  • A. It fails because a column number and a column alias cannot be used together in the ORDER BY clause.
  • B. It fails because a column alias cannot be used in the ORDER BY clause.
  • C. It displays all cities in descending order, within which the last names are further sorted in descending order.
  • D. It displays all cities in ascending order, within which the last names are further sorted in descending order.

Answer: D


NEW QUESTION # 19
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