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Oracle 1z1-071 Exam Syllabus Topics:

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

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Oracle Database SQL Sample Questions (Q266-Q271):

NEW QUESTION # 266
Examine the data in the CUST_NAME column of the CUSTOMERS table:
CUST_NAME
---------------------
Renske Ladwig
Jason Mallin
Samuel McCain
Allan MCEwen
Irene Mikkilineni
Julia Nayer
You want to display the CUST_NAME values where the last name starts with Mc or MC.
Which two WHERE clauses give the required result?

A. WHERE INITCAP(SUBSTR(cust_name, INSTR(cust_name,' ') + 1)) LIKE 'Mc%'
B. WHERE INITCAP(SUBSTR(cust_name, INSTR(cust_name,' ') + 1)) IN ('MC%','Mc%')
C. WHERE SUBSTR(cust_name, INSTR(cust_name,' ') + 1) LIKE 'Mc%' OR 'MC%'
D. WHERE UPPER(SUBSTR(cust_name, INSTR(cust_name,' ') + 1)) LIKE UPPER('MC%')
E. WHERE SUBSTR(cust_name, INSTR(cust_name,' ') + 1) LIKE 'Mc%'

Answer: D,E

Explanation:
To find customer names where the last name starts with Mc or MC, the correct queries are:
A . WHERE UPPER(SUBSTR(cust_name, INSTR(cust_name, ' ') + 1)) LIKE 'MC%' This query converts the substring of cust_name that comes after the first space (which should correspond to the last name) to uppercase and checks if it starts with 'MC', which will match both 'Mc' and 'MC'.
E . WHERE SUBSTR(cust_name, INSTR(cust_name, ' ') + 1) LIKE 'Mc%'
This query checks if the substring of cust_name after the first space starts with 'Mc'. However, this query will only match last names that start with 'Mc' and not 'MC' unless the database is using a case-insensitive collation.
Options B, C, and D are incorrect:
B is incorrect because the syntax is not valid in Oracle SQL; the LIKE clause cannot be used to match multiple patterns in that way.
C is incorrect because INITCAP would not only capitalize the first letter of 'mc' or 'Mc' but would lowercase all other letters, which is not the intended action.
D is incorrect because, like option C, INITCAP is not the appropriate function for this use case and it will not correctly identify names that start with 'MC'.

NEW QUESTION # 267
Examine the structure of the EMPLOYEEStable.

There is a parent/child relationship between EMPLOYEE_IDand MANAGER_ID.
You want to display the last names and manager IDs of employees who work for the same manager as the employee whose EMPLOYEE_IDis 123.
Which query provides the correct output?
SELECT e.last_name, m.manager_id

A. FROM employees e LEFT OUTER JOIN employees m
on (e.manager_id = m.manager_id)
WHERE e.employee_id = 123;
B. FROM employees e RIGHT OUTER JOIN employees m
on (e.manager_id = m.employee_id)
AND e.employee_id = 123;
SELECT e.last_name, m.manager_id
C. FROM employees e RIGHT OUTER JOIN employees m
on (e.employee_id = m.employee_id)
WHERE e.employee_id = 123;
SELECT m.last_name, e.manager_id
D. FROM employees e LEFT OUTER JOIN employees m
on (e.employee_id = m.manager_id)
WHERE e.employee_id = 123;
SELECT e.last_name, e.manager_id

Answer: A

Explanation:
Explanation

NEW QUESTION # 268
The PRODUCTS table has the following structure.

Evaluate the following two SQL statements:
SQL>SELECT prod_id, NVL2 (prod_expiry_date, prod_expiry_date + 15, ' ') FROM products;
SQL>SELECT prod_id, NVL (prod_expiry_date, prod_expiry_date + 15) FROM products;
Which statement is true regarding the outcome?

A. Only the first SQL statement executes successfully
Using the NVL2 Function
The NVL2 function examines the first expression. If the first expression is not null, the NVL2 function returns the second expression. If the first expression is null, the third expression is returned.
Syntax
NVL2(expr1, expr2, expr3)
In the syntax:
Expr1 is the source value or expression that may contain a null
Expr2 is the value that is returned if expr1 is not null
Expr3 is the value that is returned if expr1 is null
B. Both the statements execute and give different results
C. Only the second SQL statement executes successfully
D. Both the statements execute and give the same result

Answer: B

NEW QUESTION # 269
Examine the following query:
SQL> SELECT prod_id, amount_sold
FROM sales
ORDER BY amount_sold
FETCH FIRST 5 PERCENT ROWS ONLY;
What is the output of this query?

A. It displays 5 percent of the products with the highest amount sold.
B. It displays 5 percent of the products with the lowest amount sold.
C. It displays the first 5 percent of the rows from the SALES table.
D. It results in an error because the ORDER BY clause should be the last clause.

Answer: B

Explanation:
Explanation
References:
https://oracle-base.com/articles/12c/row-limiting-clause-for-top-n-queries-12cr1

NEW QUESTION # 270
In which three situations does a new transaction always start? (Choose three.)

A. when issuing a DML statement after a DML statement failed in the same session
B. when issuing a SELECT FOR UPDATEstatement after a CREATE TABLE AS SELECTstatement was issued in the same session
C. when issuing a TRUNCATEstatement after a SELECT statement was issued in the same session
D. when issuing the first Data Manipulation Language (DML) statement after a COMMIT or ROLLBACK statement was issued in the same session
E. when issuing a CREATE INDEXstatement after a CREATE TABLEstatement completed successfully in the same session
F. when issuing a CREATE TABLEstatement after a SELECTstatement was issued in the same session

Answer: B,D,E

NEW QUESTION # 271
......

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