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Oracle 1z1-071 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
SQL Retrieval	- SELECT statements and filtering data 1. WHERE clause and conditions 2. ORDER BY and row limiting - Joins and set operations 1. INNER, OUTER, CROSS joins 2. UNION, INTERSECT, MINUS
Relational Database Concepts	- Tables, rows, columns, and relational model basics - Data types and database objects overview
Data Manipulation and Schema Objects	- DML operations 1. INSERT, UPDATE, DELETE, MERGE - DDL operations 1. CREATE, ALTER, DROP tables and constraints
Subqueries and Advanced SQL	- Correlated subqueries and nested queries - Single-row and multi-row subqueries

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Oracle Database SQL Sample Questions (Q417-Q422):

NEW QUESTION # 417
View the Exhibit and examine the structure of the PRODUCT_INFORMATIONand INVENTORIEStables.

You have a requirement from the supplies department to give a list containing PRODUCT_ID, SUPPLIER_ID, and QUANTITY_ON_HANDfor all the products wherein QUANTITY_ON_HANDis less than five.
Which two SQL statements can accomplish the task? (Choose two.)
SELECT i.product_id, i.quantity_on_hand, pi.supplier_id

A. FROM product_information pi JOIN inventories i
ON (pi.product_id=i.product_id) AND quantity_on_hand < 5;
SELECT i.product_id, i.quantity_on_hand, pi.supplier_id
B. FROM product_information
NATURAL JOIN inventories AND quantity_on_hand < 5;
SELECT i.product_id, i.quantity_on_hand, pi.supplier_id
C. FROM product_information pi JOIN inventories i
ON (pi.product_id=i.product_id)
WHERE quantity_on_hand < 5;
SELECT product_id, quantity_on_hand, supplier_id
D. FROM product_information pi JOIN inventories i
USING (product_id) AND quantity_on_hand < 5;

Answer: A,C

NEW QUESTION # 418
Which two statements about INVISIBLE indexes are true?

A. an INVISIBLE Index consumes no storage
B. You can only create one INVISIBLE index on the same column list
C. All INSERT, UPDATE, and DELETE statements maintain entries in the index
D. You use AlTER INDEX to make an INVISIBLE Index VISIBLE
E. The query optimizer never considers INVISIBLE Indexes when determining execution plans

Answer: C,D

Explanation:
INVISIBLE indexes are a feature in Oracle Database 12c and later versions that allow an index to be maintained but not used by the optimizer unless explicitly hinted.
A . False. An INVISIBLE index still consumes storage space as it is maintained in the background.
B . False. There is no such restriction. You can create multiple INVISIBLE indexes on the same column list.
C . False. The optimizer can consider INVISIBLE indexes if they are hinted at in the query.
D . True. You can alter the visibility of an index using the ALTER INDEX command to make an INVISIBLE index VISIBLE.
E . True. Even though they are invisible to the optimizer by default, all DML operations such as INSERT, UPDATE, and DELETE continue to maintain the index as they would with a VISIBLE index.
Reference:
Oracle Documentation on Managing Indexes: https://docs.oracle.com/database/121/ADMIN/indexes.htm#ADMIN11741

NEW QUESTION # 419
Examine the data in the CUST_NAME column of the CUSTOMERS table.
CUST_NAME
-------------------
Renske Ladwig
Jason Mallin
Samuel McCain
Allan MCEwen
Irene Mikilineni
Julia Nayer
You need to display customers' second names where the second name starts with "Mc" or "MC".
Which query gives the required output?

A. SELECT SUBSTR (cust_name, INSTR (cust_name, ' ')+1)FROM customersWHERE SUBSTR (cust_name, INSTR (cust_name, ' ')+1)LIKE INITCAP ('MC%');
B. SELECT SUBSTR (cust_name, INSTR (cust_name, ' ')+1)FROM customersWHERE INITCAP (SUBSTR(cust_name, INSTR (cust_name, ' ')+1)) =INITCAP 'MC%';
C. SELECT SUBSTR (cust_name, INSTR (cust_name, ' ')+1)FROM customersWHERE INITCAP (SUBSTR(cust_name, INSTR (cust_name, ' ')+1)) ='Mc';
D. SELECT SUBSTR (cust_name, INSTR (cust_name, ' ')+1)FROM customersWHERE INITCAP (SUBSTR(cust_name, INSTR (cust_name, ' ')+1))LIKE 'Mc%';

Answer: D

NEW QUESTION # 420
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 results in an error because the ORDER BY clause should be the last clause.
C. It displays 5 percent of the products with the lowest amount sold.
D. It displays the first 5 percent of the rows from the SALES table.

Answer: C

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

NEW QUESTION # 421
Which two statements are true regarding the USINGand ONclauses in table joins?

A. The WHEREclause can be used to apply additional conditions in SELECTstatements containing the ON or the USINGclause.
B. The ON clause can be used to join tables on columns that have different names but compatible data types.
C. A maximum of one pair of columns can be joined between two tables using the ONclause.
D. Both USINGand ONclauses can be used for equijoins and nonequijoins.

Answer: A,B

Explanation:
Explanation/Reference:

NEW QUESTION # 422
......

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