Test-Taking Questions 1z1-071 Pre-assessment Test

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Oracle 1z1-071 Exam Syllabus Topics:

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

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Oracle Database SQL Sample Questions (Q409-Q414):

NEW QUESTION # 409
You want to display the date for the first Monday of the next month and issue the following command:

What is the outcome?

A. It generates an error because rrrr should be replaced by rr in the format string.
B. It executes successfully but does not return the correct result.
C. It generates an error because TO_CHAR should be replaced with TO_DATE.
D. It generates an error because fm and double quotation marks should not be used in the format string.
E. It executes successfully and returns the correct result.

Answer: E

NEW QUESTION # 410
In the PROMOTIONS table, the PROMO_BEGIN_DATEcolumn is of data type DATEand the default date format is DD-MON-RR.
Which two statements are true about expressions using PROMO_BEGIN_DATEcontained a query? (Choose two.)

A. TO_NUMBER(PROMO_BEGIN_DATE)- 5 will return a number.
B. PROMO_BEGIN_DATE - SYSDATEwill return a number.
C. PROMO_BEGIN_DATE- 5 will return a date.
D. TO_DATE(PROMO_BEGIN_DATE * 5)will return a date.
E. PROMO_BEGIN_DATE - SYSDATEwill return an error.

Answer: B,D

NEW QUESTION # 411
Which statement falls to execute successfully?

A. SELECT *
FROM employees e
JOIN departments d
ON e.department_id=d.department_id
AND d.department_id=90;
B. SELECT *
FROM employees e
JOIN departments d
ON e.department_id=d.department_id
WHERE d.department_id=90;
C. SELECT *
FROM employees e
JOIN department d
WHERE e.department_id=d.department_id
AND d.department_id=90;
D. SELECT *
FROM employees e
JOIN departments d
ON d.departments_id=90
WHERE e.department_id=d.department_id;

Answer: C

Explanation:
A: SELECT * FROM employees e JOIN department d WHERE e.department_id=d.department_id AND d.department_id=90: This statement will fail because it incorrectly uses the JOIN syntax without an ON clause, which is necessary to specify the condition on which the tables are joined. This statement mistakenly places the join condition in the WHERE clause without using ON.
Correct options (executes successfully):
B: Correctly formulated JOIN with ON and an additional condition in the WHERE clause.
C: Incorporates the filtering directly in the ON clause, which is a valid method to restrict the rows returned by the JOIN based on conditions related to both tables.
D: Although it appears awkward due to the order of conditions in the ON clause, it is syntactically correct.
These answers reflect typical use and constraints in SQL queries and are aligned with Oracle Database 12c standards for SQL syntax and operations.
Explanation:
Given the statements, the failure to execute would be due to improper SQL syntax or logical structuring of the JOIN clause:

NEW QUESTION # 412
Examine this data in the EMPLOYERS table:

Which statement will execute successfully?

A. SELECT dept_id, MAX (Last_name), SUM (salary) FROM employees GROUP BY dept_id
B. SELECT dept_id, LENGTH (last_name), SUM (salary) FROM employees GROUP BY dept_id
C. SELECT dept_id, INSTR (last_name,'A'), SUM (salary) FROM employees GROUP BY dept_id
D. SELECT dept_id, STDDEV (last_name), SUM (salary) FROM employees GROUP BY dept_id

Answer: A

NEW QUESTION # 413
View the Exhibit and examine the structure of the CUSTOMERS table.

CUSTOMER_VU is a view based on CUSTOMERS_BR1 table which has the same structure as CUSTOMERS table.
CUSTOMERS need to be updated to reflect the latest information about the customers.
What is the error in the following MERGE statement?

A. CUSTOMER_VU cannot be used as a data source.
B. The INTO clause is misplaced in the command.
C. The WHERE clause cannot be used with INSERT.
D. The CUSTOMER_ID column cannot be updated.

Answer: D

NEW QUESTION # 414
......

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