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Oracle 1z0-071 Exam Syllabus Topics:

Section	Objectives
SQL Functions	- Single-row functions 1. Character, numeric, date functions - Conversion and conditional functions 1. TO_CHAR, TO_NUMBER, CASE expressions
Subqueries and Advanced SQL	- Single-row and multi-row subqueries - Correlated subqueries and nested queries
Relational Database Concepts	- Data types and database objects overview - Tables, rows, columns, and relational model basics
Data Manipulation and Schema Objects	- DDL operations 1. CREATE, ALTER, DROP tables and constraints - DML operations 1. INSERT, UPDATE, DELETE, MERGE
SQL Retrieval	- Joins and set operations 1. INNER, OUTER, CROSS joins 2. UNION, INTERSECT, MINUS - SELECT statements and filtering data 1. ORDER BY and row limiting 2. WHERE clause and conditions

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Oracle Database SQL Sample Questions (Q160-Q165):

NEW QUESTION # 160
Examine the description of the EMPLOYEES table:

Which statement will execute successfully, returning distinct employees with non-null first names?

A. SELECT Distinct * FROM employees WHERE first_ name < > NULL;
B. SELECT first_ name, DISTINCT last_ name FROM employees WHERE first_ name < > NULL;
C. SELECT first_ name, DISTNCT last_ name FROM employees WHERE first_ name IS NOT NULL;
D. SELECT DISTINCT * FROM employees WHERE first_ name IS NOT NULL;

Answer: D

NEW QUESTION # 161
View the Exhibit and examine the structure of the ORDERStable. The ORDER_IDcolumn is the PRIMARY KEY in the ORDERStable.

Evaluate the following CREATE TABLEcommand:
CREATE TABLE new_orders(ord_id, ord_date DEFAULT SYSDATE, cus_id)
AS
SELECT order_id.order_date,customer_id
FROM orders;
Which statement is true regarding the above command?

A. The NEW_ODRDERStable would get created and all the constraints defined on the specified columns in the ORDERStable would be passed to the new table.
B. The NEW_ODRDERStable would not get created because the DEFAULTvalue cannot be specified in the column definition.
C. The NEW_ODRDERStable would get created and only the NOT NULLconstraint defined on the specified columns would be passed to the new table.
D. The NEW_ODRDERStable would not get created because the column names in the CREATE TABLE command and the SELECTclause do not match.

Answer: C

NEW QUESTION # 162
Which two statements are true about a self join?

A. It can be a left outer join.
B. It must be a full outer join.
C. It can be an inner join.
D. It must be an equijoin.
E. The join key column must have an index.

Answer: C,E

Explanation:
Explanation/Reference: https://www.oracletutorial.com/oracle-basics/oracle-self-join/

NEW QUESTION # 163
Which three queries use valid expressions?

A. SELECT product_id, expiry_date * 2 from products;
B. SELECT product_id,unit_price || 5 "Discount" , unit_price + surcharge - discount FROM products;
C. SELECT product_id,unit_price,5 "Discount", unit_price + surcharge-discount FROM products;
D. SELECT product_id, unit_price, unit_price + surcharge FROM products;
E. SELECT product_id,(expiry_date - delivery_date) * 2 FROM products;
F. SELECT product_id,(unit_price * 0.15 / (4.75 + 552.25)) FROM products;

Answer: D,E,F

Explanation:
When evaluating whether expressions in SQL queries are valid, consider data type compatibility and the operations performed:
* Option A: Valid. The expression performs arithmetic operations (multiplication and division) on numeric data types (unit_price, constants). These operations are allowed and make sense in a mathematical context.
* Option B: Valid. This query calculates the difference between two dates (expiry_date and delivery_date), which results in a numeric value representing the number of days between the dates. The result is then multiplied by 2, which is a valid operation on a numeric result.
* Option C: Invalid. The expression unit_price || 5 attempts to concatenate a numeric value with a number, which is not valid without explicit conversion to a string. Moreover, the use of quotes around
"Discount" is syntactically incorrect in this context.
* Option D: Invalid. The expression expiry_date * 2 attempts to multiply a DATE datatype by a numeric value, which is not a valid operation.
* Option E: Invalid. Similar to Option C, it incorrectly attempts to concatenate a number directly with a numeric value without conversion. Additionally, the aliasing with quotes is incorrectly placed.
* Option F: Valid. This query simply adds two numeric columns (unit_price and surcharge), which is a valid and commonly used arithmetic operation in SQL.

NEW QUESTION # 164
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 SUBSTR(cust_name, INSTR(cust_name,'') +1) LIKE'Mc%'
B. WHERE UPPER (SUBSTR(cust_name, INSTR(cust_name, '') +1)) LIKE UPPER('MC%')
C. WHERE INITCAP (SUBSTR(cust_name, INSTR(cust_name,'') +1)) IN ('MC%','Mc%)
D. WHERE INITCAP(SUBSTR(cust_name, INSTR(cust_name,'') +1)) LIKE'Mc%'
E. WHERE SUBSTR(cust_name,INSTR(cust_name,'') +1) LIKE'Mc%' OR'MC%'

Answer: B,D

NEW QUESTION # 165
......

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