Authentic Oracle 1z1-071 Exam Questions with Answers

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Oracle 1z1-071 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Using Subqueries to Solve Queries		- Correlated subqueries for update/delete - Single-row and multi-row subqueries
Topic 2: Working with Time Zones and Date/Time Data		- TIMESTAMP, INTERVAL data types - Time zone conversion functions
Topic 3: Retrieving Data Using SQL SELECT Statement	20%	- SELECT statement syntax and usage - Arithmetic operations and NULL handling - Column aliases, concatenation, literals and DISTINCT
Topic 4: Manipulating Data and Managing Transactions		- Multi-table inserts - INSERT, UPDATE, DELETE, MERGE statements - Transaction control: COMMIT, ROLLBACK, SAVEPOINT
Topic 5: Relational Database Concepts	10%	- Theoretical and physical aspects of relational databases - Relationship between database and SQL - ERD and SQL statement mapping
Topic 6: Controlling User Access		- Roles, granting and revoking privileges - System and object privileges
Topic 7: Using SET Operators		- Ordering results with set operations - UNION, UNION ALL, INTERSECT, MINUS operators
Topic 8: Using Data Dictionary Views		- Retrieve metadata and object information
Topic 9: Managing Tables and Constraints		- Temporary and external tables - Constraints: primary key, foreign key, unique, check, not null - Data types, creating/altering/dropping tables
Topic 10: Restricting and Sorting Data	15%	- WHERE clause and filtering conditions - Substitution variables, DEFINE and VERIFY commands - ORDER BY clause and sorting rules - Operator precedence
Topic 11: Displaying Data from Multiple Tables	15%	- Self-joins and outer joins - Cartesian products - Equijoins and non-equijoins
Topic 12: Using Single-Row Functions to Customize Output	20%	- Character, number, and date functions - Nested functions usage
Topic 13: Managing Views		- Updatable and read-only views - Create, modify and drop views
Topic 14: Managing Indexes, Synonyms and Sequences		- Create and use sequences - Create and use synonyms - Create and maintain indexes
Topic 15: Conversion Functions and Conditional Expressions	10%	- TO_CHAR, TO_NUMBER, TO_DATE functions - NVL, NULLIF, COALESCE and CASE expressions - Implicit and explicit data type conversion
Topic 16: Aggregating Data Using Group Functions	10%	- Handling NULLs in group functions - GROUP BY and HAVING clauses - SUM, AVG, COUNT, MAX, MIN functions

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Oracle Database SQL Sample Questions (Q78-Q83):

NEW QUESTION # 78
Choose the best answer.
Examine the description of the EMPLOYEES table:

Which query is valid?

A. SELECT dept_id,AVG(MAX(salary)) FROM employees GROUP BY dapt_id;
B. SELECT dept_id, join_date,SUM(salary) FROM employees GROUP BY dept_id, join_date;
C. SELECT dept_id,MAX(AVG(salary)) FROM employees GROUP BY dept_id;
D. SELECT depe_id,join_date,SUM(salary) FROM employees GROUP BY dept_id:

Answer: B

Explanation:
In Oracle 12c SQL, the GROUP BY clause is used to arrange identical data into groups with the GROUP BY expression followed by the SELECT statement. The SUM() function is then used to calculate the sum for each grouped record on a specific column, which in this case is the salary column.
Option A is valid because it correctly applies the GROUP BY clause. Both dept_id and join_date are included in the SELECT statement, which is a requirement when using these columns in conjunction with the GROUP BY clause. This means that the query will calculate the sum of salaries for each combination of dept_id and join_date. It adheres to the SQL rule that every item in the SELECT list must be either an aggregate function or appear in the GROUP BY clause.
Option B is invalid due to a typo in SELECT depe_id and also because it ends with a colon rather than a semicolon.
Option C is invalid because you cannot nest aggregate functions like MAX(AVG(salary)) without a subquery.
Option D is invalid for the same reason as option C, where it tries to nest aggregate functions AVG(MAX(salary)), which is not allowed directly in SQL without a subquery.
For further reference, you can consult the Oracle 12c documentation, which provides comprehensive guidelines on how to use the GROUP BY clause and aggregate functions like SUM():
Oracle Database SQL Language Reference, 12c Release 1 (12.1): GROUP BY Clause Oracle Database SQL Language Reference, 12c Release 1 (12.1): Aggregate Functions

NEW QUESTION # 79
View the Exhibit and examine the structure of ORDERS and ORDER_ITEMS tables.
ORDER_ID is the primary key in the ORDERS table and the foreign key of the ORDER_ITEMS table, whose constraint is defined with the ON DELETE CASCADE option.
Which DELETE statement would execute successfully?

A. DELETE ordersWHERE order_total < 1000;
B. DELETE orders o, order_items iWHERE o.order_id = i.order_id;
C. DELETEFROM ordersWHERE (SELECT order_idFROM order_items);
D. DELETE order_idFROM ordersWHERE order_total < 1000;

Answer: A

NEW QUESTION # 80
Which three are true about dropping columns from a table? (Choose three.)

A. A column can be removed only if it contains no data.
B. A primary key column cannot be dropped.
C. A column drop is implicitly committed.
D. A column must be set as unused before it is dropped from a table.
E. Multiple columns can be dropped simultaneously using the ALTER TABLE command.
F. A column that is referenced by another column in any other table cannot be dropped.

Answer: A,B,F

Explanation:
https://oracle-base.com/articles/8i/dropping-columns

NEW QUESTION # 81
View the Exhibit and examine the structure in the EMPLOYEES tables.

Evaluate the following SQL statement:
SELECT employee_id, department_id
FROM employees
WHERE department_id= 50 ORDER BY department_id
UNION
SELECT employee_id, department_id
FROM employees
WHERE department_id=90
UNION
SELECT employee_id, department_id
FROM employees
WHERE department_id=10;
What would be the outcome of the above SQL statement?

A. The statement would execute successfully and display all the rows in the ascending order of DEPARTMENT_ID.
B. The statement would not execute because the ORDER BY clause should appear only at the end of the SQL statement, that is, in the last SELECT statement.
C. The statement would execute successfully but it will ignore the ORDER BY clause and display the rows in random order.
D. The statement would not execute because the positional notation instead of the column name should be used with the ORDER BY clause.

Answer: B

NEW QUESTION # 82
Which statement is true about TRUNCATE and DELETE?

A. For tables with multiple indexes and triggers DELETE is faster than TRUNCATE.
B. You can never TRUNCATE a table if foreign key constraints will be violated.
C. For large tables TRUNCATE is faster than DELETE.
D. You can never DELETE rows from a table if foreign key constraints will be violated.

Answer: C

Explanation:
https://www.sqlservercentral.com/articles/difference-between-truncate-and-delete

NEW QUESTION # 83
......

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