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Oracle 1z1-071 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Displaying Data from Multiple Tables	15%	- Self-joins and outer joins - Cartesian products - Equijoins and non-equijoins
Topic 2: Manipulating Data and Managing Transactions		- Transaction control: COMMIT, ROLLBACK, SAVEPOINT - INSERT, UPDATE, DELETE, MERGE statements - Multi-table inserts
Topic 3: Using Data Dictionary Views		- Retrieve metadata and object information
Topic 4: Using Single-Row Functions to Customize Output	20%	- Nested functions usage - Character, number, and date functions
Topic 5: Relational Database Concepts	10%	- Relationship between database and SQL - ERD and SQL statement mapping - Theoretical and physical aspects of relational databases
Topic 6: Using Subqueries to Solve Queries		- Correlated subqueries for update/delete - Single-row and multi-row subqueries
Topic 7: Restricting and Sorting Data	15%	- Operator precedence - ORDER BY clause and sorting rules - Substitution variables, DEFINE and VERIFY commands - WHERE clause and filtering conditions
Topic 8: Managing Views		- Create, modify and drop views - Updatable and read-only views
Topic 9: Aggregating Data Using Group Functions	10%	- Handling NULLs in group functions - GROUP BY and HAVING clauses - SUM, AVG, COUNT, MAX, MIN functions
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: Retrieving Data Using SQL SELECT Statement	20%	- Arithmetic operations and NULL handling - SELECT statement syntax and usage - Column aliases, concatenation, literals and DISTINCT
Topic 12: Using SET Operators		- Ordering results with set operations - UNION, UNION ALL, INTERSECT, MINUS operators
Topic 13: Controlling User Access		- Roles, granting and revoking privileges - System and object privileges
Topic 14: Working with Time Zones and Date/Time Data		- TIMESTAMP, INTERVAL data types - Time zone conversion functions
Topic 15: Managing Indexes, Synonyms and Sequences		- Create and maintain indexes - Create and use synonyms - Create and use sequences
Topic 16: Conversion Functions and Conditional Expressions	10%	- Implicit and explicit data type conversion - NVL, NULLIF, COALESCE and CASE expressions - TO_CHAR, TO_NUMBER, TO_DATE functions

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Oracle Database SQL Sample Questions (Q287-Q292):

NEW QUESTION # 287
Which three tasks can be performed using SQL functions built into Oracle Database? (Choose three.)

A. Displaying a date in a nondefault format
B. Combining more than two columns or expressions into a single column in the output
C. Substituting a character string in a text expression with a specified string
D. Finding the number of characters in an expression

Answer: A,C,D

NEW QUESTION # 288
Examine the description of the ORDER_ITEMStable:

Examine this incomplete query:

Which two can replace <clause> so the query completes successfully? (Choose two.)

A. product_id
B. quantity
C. quantity, unit_price
D. quantity * unit_price
E. total_paid

Answer: D,E

Explanation:
Sample
SELECT tr_sub.cur_tt, tr_sub.item, sum(tr.quantity), sum(tr.quantity*tr.unit_price) FROM (SELECT tr1.transaction_time as cur_tt, max(tr2.transaction_time) as prev_tt, tr1.item as item, IF (tr1.unit_price=tr2.unit_price, tr1.unit_price, tr2.unit_price) as t_p FROM transactions tr1 LEFT JOIN transactions tr2 ON tr1.transaction_time>=tr2.transaction_time AND tr1.item=tr2.item GROUP BY tr1.item, tr1.transaction_time, t_p Reference: https://stackoverflow.com/questions/50771172/sql-query-get-total-value-based-on-different-unit- price-quantity-at-different-ti

NEW QUESTION # 289
Examine the structure of the MARKS table:

Which two statements would execute successfully? (Choose two.)

A. SELECT student_name subject1
FROM marks
WHERE subject1 > AVG(subject1);
B. SELECT SUM(subject1+subject2+subject3)
FROM marks
WHERE student_name IS NULL;
C. SELECT SUM(DISTINCT NVL(subject1,0)), MAX(subject1)
FROM marks
WHERE subject1 > subject2;
D. SELECT student_name,SUM(subject1)
FROM marks
WHERE student_name LIKE `R%';

Answer: B,C

NEW QUESTION # 290
Examine this list of requirements for a sequence:
1. Name:EMP_SEQ
2. First value returned:1
3. Duplicates are never permitted.
4. Provide values to be inserted into the EMPLOYEES.EMPLOYEE_ID COLUMN.
5. Reduce the chances of gaps in the values.
Which two statements will satisfy these requirements?

A. CREATE SEQUENCE emp_seq START WITH 1 INCREMENT BY 1 CACHE;
B. CREATE SEQUENCE emp_seq START WITH 1 CACHE;
C. CREATE SEQUENCE emp_seq NOCACHE;
D. CREATE SEQUENCE emp_seq START WITH 1 INCREMENT BY 1 CYCLE;
E. CREATE SEQUENCE emp_seq START WITH 1 INCRENENT BY 1 NOCACHE;
F. CREATE SEQUENCE emp_seq;

Answer: A,E

Explanation:
* A: 'CREATE SEQUENCE emp_seq START WITH 1 INCREMENT BY 1 NOCACHE;' is correct for ensuring unique values without gaps as much as possible by not caching sequence numbers, which might otherwise be lost in a system crash.
* B: CYCLE allows the sequence to restart when its max/min value is reached, which does not help with requirement 3 (duplicates are never permitted). Therefore, B is incorrect.
* C: This lacks the necessary attributes like START WITH and INCREMENT BY which are crucial to defining a sequence. Thus, statement C is incorrect.
* D: 'CREATE SEQUENCE emp_seq START WITH 1 CACHE;' might introduce gaps due to the caching of sequence numbers. This statement is somewhat contrary to requirement 5.
* E: 'CREATE SEQUENCE emp_seq START WITH 1 INCREMENT BY 1 CACHE;' will provide continuous unique values, but may include gaps when the cache is lost due to a restart, yet it is more efficient and still generally aligns with the requirements. Hence, statement E is considered correct.
* F: This lacks detail and is too ambiguous, lacking the necessary parameters. Therefore, F is incorrect.

NEW QUESTION # 291
Which three statements are true about views in an Oracle database?

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

Answer: C,D,E

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 # 292
......

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