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Oracle 1z1-071 Exam Syllabus Topics:

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

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Oracle Database SQL Sample Questions (Q303-Q308):

NEW QUESTION # 303
Which three statements are true about views in an Oracle database?

A. Inserting one or more rows using a view whose defining query contains a GROUP BY clause will cause an error.
B. Deleting one or more rows using a view whose defining query contains a GROUP BY clause will cause an error.
C. The WITH CHECK clause prevents certain rows from being updated or inserted.
D. Date Manipulation Language (DML) can always be used on views.
E. The WITH CHECK clause prevents certain rows from being displayed when querying the view.
F. Tables in the defining query of a view must always exist in order to create the view.
G. Views can be updated without the need to re-grant privileges on the view.

Answer: A,B,C

Explanation:
For question 138 regarding Oracle views, the correct answers are B, E, and G:
B . The WITH CHECK OPTION clause prevents certain rows from being updated or inserted: This clause ensures that all data modifications performed through the view result in data that conforms to the view's defining query.
E . Deleting one or more rows using a view whose defining query contains a GROUP BY clause will cause an error: Views that involve aggregate functions, GROUP BY clauses, or DISTINCT cannot be directly modified with DML operations such as DELETE, because the underlying data manipulation would be ambiguous.
G . Inserting one or more rows using a view whose defining query contains a GROUP BY clause will cause an error: Similarly to DELETE, INSERT operations into a view that uses a GROUP BY clause are generally not allowed because it's unclear how the new rows should be aggregated into the existing groups.
Other options are incorrect because:
A: The WITH CHECK OPTION clause does not prevent rows from being displayed; it restricts DML operations.
C: Views can be created with non-existent underlying tables or views using the FORCE option in Oracle.
D: Not all views are updatable, especially those involving joins, group functions, or distinct aggregation.
F: Updating a view does not impact the granted privileges unless the definition of the view changes.

NEW QUESTION # 304
Evaluate the following SQL statements that are issued in the given order: CREATE TABLE emp
(emp_no NUMBER(2) CONSTRAINT emp_emp_no_pk PRIMARY KEY,
enameVARCHAR2(15),
salary NUMBER(8,2),
mgr_no NUMBER(2) CONSTRAINT emp_mgr_fk REFERENCES emp);
ALTER TABLE emp
DISABLE CONSTRAINT emp_emp_no_pk CASCADE;
ALTER TABLE emp
ENABLE CONSTRAINT emp_emp_no_pk;
What would be the status of the foreign key EMP_MGR_FK?

A. It would be automatically enabled and deferred.
B. It would remain disabled and can be enabled only by dropping the foreign key constraint and re-creating it.
C. It would be automatically enabled and immediate.
D. It would remain disabled and has to be enabled manually using the ALTER TABLE command.

Answer: A,B,C

NEW QUESTION # 305
Evaluate the following SQL statement:

Which statement is true regarding the outcome of the above query?

A. It produces an error because positional notation cannot be used in the ORDER BY clause with SET operators.
B. It produces an error because the ORDER BY clause should appear only at the end of a compound query-that is, with the last SELECT statement.
C. It executes successfully but ignores the ORDER BY clause because it is not located at the end of the compound statement.
D. It executes successfully and displays rows in the descending order of PROMO_CATEGORY.

Answer: B

NEW QUESTION # 306
Examine this query:
SELECT employee_id, first_name, salary
FROM employees
WHERE hiredate > 61*
Which two methods should yours to prevent prompting for hire date value when this queries executed?

A. Execute the SET VERIFY ON command before executing the query.
B. Execute the SET VERIFY OFF command before executing the query.
C. Use the DEFINE command before executing the query
D. Use the UNDEFINE command before executing the query.
E. Store the query in a script and pass the substitution value to the script when executing it.
F. Replace 's1' with &1'in the query:

Answer: B,C

Explanation:
To prevent the prompting for a substitution variable value when executing a query:
B . Execute the SET VERIFY OFF command before executing the query: This command turns off the substitution variable prompting, which means that SQL*Plus will not prompt for a value and will use whatever value is currently set for that variable.
F . Use the DEFINE command before executing the query: By using the DEFINE command to set a value for the variable before the query execution, you ensure that SQL*Plus uses this predefined value instead of prompting for it.
Reference:
Oracle SQL*Plus User's Guide and Reference, which discusses how to manage substitution variables.

NEW QUESTION # 307
Examine this SQL statement:

Which two are true? (Choose two.)

A. The subquery is not a correlated subquery
B. The UPDATEstatement executes successfully even if the subquery selects multiple rows
C. The subquery is executed before the UPDATEstatement is executed
D. The subquery is executed for every updated row in the ORDERStable
E. All existing rows in the ORDERStable are updated

Answer: C,E

NEW QUESTION # 308
......

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