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Oracle 1z1-071 Exam Syllabus Topics:

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

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Oracle Database SQL Sample Questions (Q24-Q29):

NEW QUESTION # 24
Examine the description of the PROMOTIONS TABLE:
You want to display the unique is promotion costs in each promotion category.
Which two queries can be used?

A. select DISTINCT promo_categoryIl 'has'||promol_cost as COSTS FROM promotions ORDER BY 1:
B. SELECT promo_cost, promo_category FROM promotions ORDER BY 1
C. SELECT DISTINCT promo_cost ||'in'IIDISTINCT promo_category promotions ORDER BY1;
D. SELECT promo_category, DISTINCT promo_cost FROM promotiong ORDER BY 2:
E. SELECT DISTINCT promo_category, promo_cost FROM promotions ORDER BY 1;

Answer: A,E

NEW QUESTION # 25
Examine the description of the CUSTOMERStable:

You want to display details of all customers who reside in cities starting with the letter D followed by at least two characters.
Which query can be used?
SELECT * FROM customers WHERE city = 'D_%';

A.
B. SELECT * FROM customers WHERE city = '%D_';
C. SELECT * FROM customers WHERE city LIKE 'D_';
D. SELECT * FROM customers WHERE city LIKE 'D_%';

Answer: B

NEW QUESTION # 26
What is true about non-equijoin statement performance?

A. The between condition always performs better than using the >= and <= conditions.
B. Table aliases can improve performance.
C. The join syntax used makes no difference to performance.
D. The Oracle join syntax performs better than the SQL: 1999 compliant ANSI join syntax.
E. The between condition always performs less well than using the >= and <= conditions.

Answer: C

Explanation:
Performance implications related to non-equijoin SQL statements in Oracle Database are often a topic of optimization:
* C. The join syntax used makes no difference to performance: In Oracle Database, the performance of a query involving joins is typically more dependent on factors like the underlying data distribution, indexes, optimizer statistics, and system configuration rather than the syntax (ANSI vs Oracle traditional syntax). The optimizer in Oracle is sophisticated enough to interpret different syntactical expressions of joins and optimize them accordingly.
References:
* Oracle Database Performance Tuning Guide 12c, which discusses the impact of different join syntaxes and how Oracle's optimizer handles them.

NEW QUESTION # 27
You execute this command:

Which two are true?

A. A FLASHBACK TABLE statement can be used to retrieve the deleted data.
B. It retains the integrity constraints defined on the table.
C. It drops any triggers defined on the table.
D. It always retains the space used by the removed rows.
E. A ROLLBACK statement can be used to retrieve the deleted data.
F. It retains the indexes defined on the table.

Answer: B,F

NEW QUESTION # 28
View the Exhibit and examine the structure of ORDER_ITEMS and ORDERS tables.

You need to remove from the ORDER_ITEMS table those rows that have an order status of 0 or
1 in the ORDERS table.
Which two DELETE statements are valid (Choose two.)

A. DELETE
* FROM order_items
WHERE order_id IN (SELECT order_id)
FROM orders
WHERE order_status IN (0,1));
B. DELETE
FROM (SELECT * FROM order_items I,orders o
WHERE i.order_id = o.order_id AND order_status IN (0,1));
C. DELETE
FROM order_items
WHERE order_id IN (SELECT order_id
FROM orders
WHERE orders_status in (0,1));
D. DELETE FROM order_items i
WHERE order_id = (SELECT order_id FROM orders o
WHERE i.order_id = o.order_id AND order_status IN (0,1));

Answer: B,C

NEW QUESTION # 29
......

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