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Oracle 1z0-071 Exam Syllabus Topics:

Section	Weight	Objectives
Working with Oracle Database SQL	8%	- Explain the installation of Oracle Database software - Start up and shut down a database - Create a container database - Describe the Oracle Database architecture
Using Single-Row Functions to Customize Output	10%	- Perform arithmetic with date data - Manipulate numbers with the ROUND, TRUNC, and MOD functions - Manipulate strings with character function in the SELECT and WHERE clauses - Describe the differences between single-row and multiple-row functions - Manipulate dates with the date functions
Reporting Aggregated Data Using Group Functions	15%	- Identify the available group functions - Include or exclude grouped rows by using the HAVING clause - Describe the use of group functions - Group data by using the GROUP BY clause
Manipulating Data	14%	- Insert rows into a table - Control transactions - Update rows in a table - Describe each data manipulation language (DML) statement - Delete rows from a table
Retrieving Data Using the SQL SELECT Statement	5%	- Execute a basic SELECT statement - Differentiate between SQL statements and SQL*Plus commands - List the capabilities of SQL SELECT statements
Using Set Operators	5%	- Use a set operator to combine multiple queries into a single query - Describe the order of precedence when the set operators are used - Describe set operators
Using Conversion Functions and Conditional Expressions	10%	- Use the TO_CHAR, TO_NUMBER, and TO_DATE conversion functions - Apply the NVL, NULLIF, and COALESCE functions to data - Describe implicit and explicit data type conversion - Use conditional IF THEN ELSE logic in a SELECT statement
Creating Other Schema Objects	10%	- Create, maintain, and use sequences - Create, modify, and retrieve data from a view - Create synonyms for database objects - Create and maintain indexes
Restricting and Sorting Data	6%	- Use ampersand substitution to restrict and sort output at runtime - Limit the rows that are retrieved by a query - Sort the rows that are retrieved by a query - Use DEFINE and UNDEFINE commands
Using DDL Statements to Create and Manage Tables	14%	- Review the table structure - Alter table definitions - Categorize the main database objects - Drop, rename, and truncate tables - Describe the data types that are available for columns - Create a simple table
Displaying Data from Multiple Tables Using Joins	15%	- View data that does not meet a join condition by using outer joins - Join a table to itself by using a self-join - Write SELECT statements to access data from more than one table using equijoins and non-equijoins - Cross join tables
Controlling User Access	5%	- Differentiate system privileges from object privileges - Distinguish between granting privileges and roles - Grant privileges on tables and on a view
Using Subqueries to Solve Queries	15%	- Write single-row and multi-row subqueries - List the types of subqueries - Define subqueries - Describe the types of problems that subqueries can solve

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Oracle Database SQL Sample Questions (Q422-Q427):

NEW QUESTION # 422
Examine these SQL statements which execute successfully:

Which two statements are true after execution?

A. The foreign key constraint will be disabled.
B. The primary key constraint will be enabled and IMMEDIATE.
C. The primary key constraint will be enabled and DEFERRED.
D. The foreign key constraint will be enabled and IMMEDIATE.
E. The foreign key constraint will be enabled and DEFERRED.

Answer: B,D

Explanation:
After the execution of the given SQL statements:
B . The primary key constraint will be enabled and IMMEDIATE. This is true. The last statement ENABLE CONSTRAINT emp_emp_no_pk; enables the primary key constraint immediately.
E . The foreign key constraint will be enabled and IMMEDIATE. This is correct as well. The foreign key constraint emp_mgr_fk was not explicitly disabled, so it remains enabled and in the immediate checking mode.
Options A, C, and D are incorrect:
A is incorrect because constraints are immediate by default; they are not deferred unless explicitly stated.
C is incorrect because the foreign key constraint emp_mgr_fk was never disabled with the given statements.
D is incorrect because there is no statement altering the foreign key constraint to a deferred state.

NEW QUESTION # 423
Examine the description of the EMPLOYEES table:

Which query requires explicit data type conversion?

A. SELECT join_date FROM employees WHERE join_date > '10-02-2018';
B. SELECT join_date || ' ' || salary FROM employees;
C. SELECT join_date + '20' FROM employees;
D. SELECT SUBSTR(join_date, 1, 2) - 10 FROM employees;
E. SELECT salary + '120.50' FROM employees;

Answer: C

NEW QUESTION # 424
Examine the description or the BOOKS_TRANSACTIONS table:

FOR customers whose income level has a value, you want to display the first name and due amount as 5% of their credit limit. Customers whose due amount is null should not be displayed.
Which query should be used?

A. SELECT cust_first_name, cust_credit_limit * . 05 AS DUE AMOUNT
FROM customers
WHERE cust income_level IS NOT NULL
AND due_amount IS NOT NULL;
B. SELECT cust_first_name, cust_credit_limit * . 05 AS DUE AMOUNT
FROM customers
WHERE cust_income_level IS NOT NULL
AND cust_credit_limit IS NOT NULL;
C. SELECT cust_first_name, cust_credit_limit * . 05 AS DUE AMOUNT
FROM customers
WHERE cust income_level <> NULL
AND due_amount <> NULL;
D. SELECT cust_first_name, cust_credit_limit * . 05 AS DUE AMOUNT
FROM customers
WHERE cust income_level !=NULL
AND due_amount !=NULL;
E. SELECT cust_first_name, cust_credit_limit * . 05 AS DUE AMOUNT
FROM customers
WHERE cust income_level !=NULL
AND cust credit_level !=NULL;

Answer: B

NEW QUESTION # 425
BOOK_SEQ is an existing sequence in your schema.
Which two CREATE TABLE commands are valid?

A. CREATE TABLE bookings (
bk_id NUMBER(4) DEFAULT book_seq.CURRVAL,
start_date DATE DEFAULT SYSDATE,
end_date DATE DEFAULT start date);
B. CREATE TABLE bookings ( bk_id NUMBER(4),
start_date DATE DEFAULT SYSDATE,
end_date DATE DEFAULT (end_date >= start_date));
C. CREATE TABLE bookings (
bk_id NUMBER(4) NOT NULL PRIMARY KEY,
start_date DATE NOT NULL,
end_date DATE DEFAULT SYSDATE);
D. CREATE TABLE bookings (
bk_id NUMBER(4) NOT NULL DEFAULT book_seq.CURRVAL,
start_date DATE NOT NULL,
end_date DATE DEFAULT SYSDATE);
E. CREATE TABLE bookings (
bk_id NUMBER(4) DEFAULT book_seq.NEXTVAL PRIMARY KEY,
start_date DATE DEFAULT SYSDATE,
end_date DATE DEFAULT SYSDATE NOT NULL);

Answer: C,E

Explanation:
For creating tables and utilizing sequences in Oracle 12c SQL, certain rules apply:
* Option A: This statement is valid. It creates a table with a primary key and dates, where the default value for end_date is SYSDATE. There are no constraints on sequences, and all syntax is correct.
* Option B: This option is invalid because it attempts to use CURRVAL of a sequence as a default value for a primary key. CURRVAL cannot be used until the sequence's NEXTVAL has been called in the session.
* Option C: Invalid syntax because 'start date' is not a recognized default expression in Oracle SQL. If the intention was to use 'start_date' as a reference, it still would not work correctly without proper syntax for conditional default values.
* Option D: This syntax is invalid in Oracle SQL because the DEFAULT clause does not support relational conditions directly within the table definition.
* Option E: Valid. It correctly uses NEXTVAL for a sequence in the DEFAULT clause for the primary key, ensuring that each new record has a unique primary key generated from the sequence. The start_date and end_date are assigned defaults of SYSDATE, which is syntactically correct.

NEW QUESTION # 426
Examine this data in the EMPLOYERS table:

Which statement will execute successfully?

A. SELECT dept_id, STDDEV (last_name), SUM (salary) FROM employees GROUP BY dept_id
B. SELECT dept_id, LENGTH (last_name), SUM (salary) FROM employees GROUP BY dept_id
C. SELECT dept_id, INSTR (last_name,'A'), SUM (salary) FROM employees GROUP BY dept_id
D. SELECT dept_id, MAX (Last_name), SUM (salary) FROM employees GROUP BY dept_id

Answer: D

NEW QUESTION # 427
......

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