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Oracle 1z0-071 Exam Syllabus Topics:

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

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Oracle Database SQL Sample Questions (Q420-Q425):

NEW QUESTION # 420
Examine the structure of the DEPARTMENTS table.

You execute the following command:

Which two statements are true? (Choose two.)

A. Synonyms existing of the DEPARTMENTStable would have to be re-created.
B. Unique key constraints defined on the COUNTRYcolumn are removed.
C. A new column, COUNTRY, can be added to the DEPARTMENTStable after executing the command.
D. Views created in the DEPARTMENTStable that include the COUNTRYcolumn are automatically modified and remain valid.
E. Indexes created on the COUNTRYcolumn exist until the DROP UNUSED COLUMNScommand is executed.

Answer: B,C

NEW QUESTION # 421
View the Exhibit and examine the description for the SALES and CHANNELS tables. (Choose the best answer.)

You issued this SQL statement:

Which statement is true regarding the result?

A. The statement will fail because a subquery cannot be used in a VALUES clause.
B. The statement will execute and a new row will be inserted in the SALES table.
C. The statement will fail because the VALUES clause is not required with the subquery.
D. The statement will fail because the subquery in the VALUES clause is not enclosed within single quotation marks.

Answer: B

NEW QUESTION # 422
Examine the description of the transactions table:

Which two SQL statements execute successfully?

A. SELECT customer_id AS 'CUSTOMER-ID',transaction_date AS DATE, amount+100 'DUES' from transactions;
B. SELECT customer_id AS "CUSTOMER-ID", transaction_date AS DATE, amount+100 "DUES" from transactions;
C. SELECT customer_id CUSTID, transaction_date TRANS_DATE,amount+100 DUES FROM transactions;
D. SELECT customer id AS CUSTOMER-ID, transaction_date AS TRANS_DATE, amount+100 "DUES AMOUNT" FROM transactions;
E. SELECT customer_id AS "CUSTOMER-ID", transaction_date AS "DATE", amount+100 DUES FROM transactions;

Answer: B,C

Explanation:
A . True, this statement will execute successfully. In Oracle SQL, column aliases can be given in double quotes which allows the use of special characters like a hyphen. Additionally, you can perform arithmetic operations such as amount+100 directly in the SELECT clause to return increased values of amount.
C . True, this statement is also valid. It does not use any special characters or reserved keywords as aliases that would require double quotes. The arithmetic operation is the same as in option A, which is permissible.
For B, D, and E, the reasons for failure are: B. In Oracle SQL, single quotes are used for string literals, not for column aliases. Therefore, using single quotes around 'CUSTOMER-ID' and 'DUES' will result in an error. D. The word "DATE" is a reserved keyword in Oracle SQL. When used as a column alias without double quotes, it will lead to an error. In this statement, although "DATE" is in double quotes, it's a best practice to avoid using reserved keywords as aliases. E. There are syntax errors in the statement. "customer id" should be "customer_id", and the alias "CUSTOMER-ID" should be enclosed in double quotes if special characters are used. Also, "DUES AMOUNT" as an alias should be in double quotes to be valid because it contains a space.
Reference:
Oracle documentation on column aliases: Oracle Database SQL Language Reference Oracle reserved words: Oracle Database SQL Language Reserved Words

NEW QUESTION # 423
You must display details of all users whose username contains the string 'ch_'. (Choose the best answer.) Which query generates the required output?

A. SELECT * FROM users
Where user_name LIKE '%ch_%'ESCAPE'%';
B. SELECT * FROM users
Where user_name LIKE '%ch_';
C. SELECT * FROM users
Where user_name LIKE '%ch\_%' ESCAPE '\';
D. SELECT * FROM users
Where user_name LIKE 'ch\_%' ESCAPE '_';

Answer: A

NEW QUESTION # 424
Examine this partial command:

Which two clauses are required for this command to execute successfully?

A. the DEFAULT DIRECTORYclause
B. the REJECT LIMITclause
C. the access driver TYPEclause
D. the LOCATIONclause
E. the ACCESS PARAMETERSclause

Answer: C,D

NEW QUESTION # 425
......

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