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Oracle 1z0-071 Exam Syllabus Topics:

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

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Oracle Database SQL Sample Questions (Q317-Q322):

NEW QUESTION # 317
View the Exhibit and examine the structure of the CUSTOMERS table.

You want to generate a report showing the last names and credit limits of all customers whose last names start with A, B, or C, and credit limit is below 10,000.
Evaluate the following two queries:
SQL> SELECT cust_last_name, cust_credit_limit FROM customers
WHERE (UPPER(cust_last_name) LIKE 'A%' OR
UPPER (cust_last_name) LIKE 'B%' OR UPPER (cust_last_name) LIKE 'C%')
AND cust_credit_limit < 10000;
SQL>SELECT cust_last_name, cust_credit_limit FROM customers
WHERE UPPER (cust_last_name) BETWEEN 'A' AND 'C'
AND cust_credit_limit < 10000;
Which statement is true regarding the execution of the above queries?

A. Both execute successfully and give the same result
B. Only the first query gives the correct result
C. Only the second query gives the correct result
D. Both execute successfully but do not give the required result

Answer: B

NEW QUESTION # 318
Which three statements are true about sequences in a single instance Oracle database?

A. Two or more tables cannot have keys generated from the same sequence.
B. A sequence can only be dropped by a DBA.
C. Sequences can always have gaps.
D. A sequence's unallocated cached values are lost if the instance shuts down.
E. A sequence can issue duplicate values.
F. A sequence number that was allocated can be rolled back if a transaction fails.

Answer: C,D,F

Explanation:
Sequences are database objects used to generate unique numeric identifiers. Here's the correct understanding of sequences in Oracle:
* A: Correct. Cached sequence values that are not yet used are lost if the database instance shuts down, as the cache is held in memory.
* B: Incorrect. The same sequence can be used to generate keys for more than one table. There is no such limitation.
* C: Correct. If a transaction using a sequence number is rolled back, the sequence number that was used or allocated is not reused.
* D: Incorrect. By their nature and configuration, sequences are designed to avoid issuing duplicate values unless explicitly designed to cycle.
* E: Correct. Sequences may have gaps, which can occur due to caching, sequence increment settings, or if a transaction using a sequence number is rolled back.
* F: Incorrect. A sequence can be dropped by any user with adequate privileges, not just a DBA.

NEW QUESTION # 319
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 fm and double quotation marks should not be used in the format string.
B. It executes successfully and returns the correct result.
C. It executes successfully but does not return the correct result.
D. It generates an error because TO_CHAR should be replaced with TO_DATE.
E. It generates an error because rrrr should be replaced by rr in the format string.

Answer: B

NEW QUESTION # 320
View the Exhibit and examine the data in the PRODUCTS table.

Which statement would add a column called PRICE, which cannot contain NULL?

A. ALTER TABLE products
ADD price NUMBER(8,2) DEFAULT CONSTRAINT p_nn NOT NULL.
B. ALTER TABLE products
ADD price NUMBER(8,2) DEFAULT 0 NOT NULL;
C. ALTER TABLE products
ADD price NUMBER(8,2) DEFAULT NOT NULL;
D. ALTER TABLE products
ADD price NUMBER(8,2) NOT NULL;

Answer: B

NEW QUESTION # 321
View the Exhibit and examine the structure of the CUSTOMERStable.

CUSTOMER_VUis a view based on CUSTOMERS_BR1 table which has the same structure as CUSTOMERStable.
CUSTOMERSneed to be updated to reflect the latest information about the customers.
What is the error in the following MERGEstatement?

A. The WHEREclause cannot be used with INSERT.
B. The INTOclause is misplaced in the command.
C. CUSTOMER_VUcannot be used as a data source.
D. The CUSTOMER_IDcolumn cannot be updated.

Answer: D

Explanation:
Explanation/Reference:

NEW QUESTION # 322
......

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