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Oracle 1z1-071 Exam Syllabus Topics:

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

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Oracle Database SQL Sample Questions (Q171-Q176):

NEW QUESTION # 171
View the exhibit and examine the structure of the SALES, CUSTOMERS, PRODUCTS and TIMES tables.

The PROD_ID column is the foreign key in the SALES table referencing the PRODUCTS table.
The CUST_ID and TIME_ID columns are also foreign keys in the SALES table referencing the CUSTOMERS and TIMES tables, respectively.
Examine this command:
CREATE TABLE new_sales (prod_id, cust_id, order_date DEFAULT SYSDATE)
AS
SELECT prod_id, cust_id, time_id
FROM sales;
Which statement is true?

A. The NEW_SALES table would get created and all the FOREIGN KEY constraints defined on the selected columns from the SALES table would be created on the corresponding columns in the NEW_SALES table.
B. The NEW_SALES table would get created and all the NOT NULL constraints defined on the selected columns from the SALES table would be created on the corresponding columns in the NEW_SALES table.
C. The NEW_SALES table would not get created because the column names in the CREATE TABLE command and the SELECT clause do not match.
D. The NEW_SALES table would not get created because the DEFAULT value cannot be specified in the column definition.

Answer: B

NEW QUESTION # 172
View the exhibits and examine the structures of the COSTS and PROMOTIONS tables.

Evaluate the following SQL statement:
SQL> SELECT prod_id FROM costs
WHERE promo_id IN (SELECT promo_id FROM promotions
WHERE promo_cost < ALL
(SELECT MAX(promo_cost) FROM promotions
GROUP BY (promo_end_date-
promo_begin_date)));
What would be the outcome of the above SQL statement?

A. It displays prod IDs in the promo with the lowest cost.
B. It displays prod IDs in the promos which cost less than the highest cost in the same time interval.
C. It displays prod IDs in the promos with the lowest cost in the same time interval.
D. It displays prod IDs in the promos with the highest cost in the same time interval.

Answer: B

NEW QUESTION # 173
Which two queries return the string Hello! we're ready?

A. SELECT q'! Hello! We're ready! 'FROM DUAL;
B. SELECT "Hello! We're ready "FROM |DUAL;
C. SELECT 'Hello! we\ re ready' ESCAPE'N'FROMDUAL:
D. SELECT 'Hello! We're ready' FROM DUAL;
E. SELECT q'[Hello! We're ready]'FROM DUAL;

Answer: A,E

Explanation:
In Oracle SQL, the q quote operator can be used to define string literals that contain single quotes or other special characters without needing to escape them. The queries using the q quote mechanism, like in options A and C, will successfully return the string as it is, including single quotes within the string.
* A: Correct, it uses the q quote operator with the exclamation mark ! as the delimiter, which allows the string to contain single quotes.
* B: Incorrect, double quotes " in Oracle SQL are used for identifiers such as column names, not string literals.
* C: Correct, this also uses the q quote operator, with the square brackets [] as the delimiters.
* D: Incorrect, the backslash \ is not used as an escape character in Oracle SQL string literals, and the ESCAPE keyword is used incorrectly here.
* E: Incorrect, this does not account for the single quote within the string, which would terminate the string literal prematurely, and it lacks the q quote operator or proper escape mechanism.

NEW QUESTION # 174
Which three statements are true about views in an Oracle Database? (Choose three.)

A. Views have no segment.
B. Views can join tables only if they belong to the same schema.
C. A view can be created that refers to a non-existent table in its defining query.
D. A SELECT statement cannot contain a WHERE clause when querying a view containing a WHEREclause in its defining query.
E. Rows inserted into a table using a view are retained in the table if the view is dropped.
F. Views have no object number.

Answer: B,C,F

Explanation:
Explanation/Reference: https://docs.oracle.com/cd/B28359_01/server.111/b28286/statements_8004.htm#SQLRF01504
https://community.oracle.com/thread/2178948

NEW QUESTION # 175
Which three statements are true about sequences in a single instance Oracle database? (Choose three.)

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

Answer: C,D,E

NEW QUESTION # 176
......

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