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Oracle 1z1-071 Exam Syllabus Topics:

Section	Objectives
Topic 1: Data Manipulation and Schema Objects	- DML operations 1. INSERT, UPDATE, DELETE, MERGE - DDL operations 1. CREATE, ALTER, DROP tables and constraints
Topic 2: SQL Functions	- Single-row functions 1. Character, numeric, date functions - Conversion and conditional functions 1. TO_CHAR, TO_NUMBER, CASE expressions
Topic 3: Subqueries and Advanced SQL	- Correlated subqueries and nested queries - Single-row and multi-row subqueries
Topic 4: Relational Database Concepts	- Data types and database objects overview - Tables, rows, columns, and relational model basics
Topic 5: SQL Retrieval	- Joins and set operations 1. INNER, OUTER, CROSS joins 2. UNION, INTERSECT, MINUS - SELECT statements and filtering data 1. WHERE clause and conditions 2. ORDER BY and row limiting

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Oracle Database SQL Sample Questions (Q176-Q181):

NEW QUESTION # 176
View the Exhibit and examine the data in ORDERS_MASTER and MONTHLYjDRDERS tables.

Evaluate the following MERGE statement:
MERGE INTO orders_master o USING monthly_orders m ON (o.order_id = m.order_id) WHEN MATCHED THEN UPDATE SET o.order_total = m.order_total DELETE WHERE (m.order_total IS NULL) WHEN NOT MATCHED THEN
INSERT VALUES (m.order_id, m.order_total);
What would be the outcome of the above statement?

A. The ORDERS_MASTER table would contain the ORDERJDs 1,2 and 3.
B. The ORDERS_MASTER table would contain the ORDERJDs 1 and 2.
C. The ORDERS MASTER table would contain the ORDER IDs 1,2,3 and 4.
D. The ORDERS_MASTER table would contain the ORDERJDs 1,2 and 4.

Answer: D

NEW QUESTION # 177
Which two statements are true about substitution variables?

A. A substitution variable can be used with any clause in a SELECT statement.
B. A substitution variable used to prompt for a column name must be endorsed in single quotation marks.
C. A substitution variable can be used only in a SELECT statement.
D. A substitution variable used to prompt for a column name must be endorsed in double quotation marks.
E. A substitution variable prefixed with & always prompts only once for a value in a session.
F. A substitution variable prefixed with 6 prompts only once for a value in a session unless is set to undefined in the session.

Answer: A,E

Explanation:
Substitution variables in Oracle are used to replace a value dynamically during the execution of SQL statements. The behavior of these variables is well-documented:
C . A substitution variable prefixed with & always prompts only once for a value in a session: This is true. In a session, when you use a single ampersand (&), SQL*Plus or SQL Developer will prompt for the value the first time the variable is encountered. The value for this variable will then be reused for the remainder of the session unless it is redefined.
D . A substitution variable can be used with any clause in a SELECT statement: Substitution variables can be placed in any part of a SQL statement, including the SELECT, WHERE, GROUP BY, ORDER BY, etc. They are not limited to any specific clause.
Reference:
Oracle SQL*Plus User's Guide and Reference, which discusses substitution variables.

NEW QUESTION # 178
Examine the structure of the BOOKS_TRANSACTIONS table:

You want to display the member IDs, due date, and late fee as $2 for all transactions.
Which SQL statement must you execute?

A. SELECT member_id 'MEMBER ID', due_date 'DUE DATE', '$2 AS LATE FEE' FROM BOOKS_TRANSACTIONS;
B. SELECT member_id AS "MEMBER ID", due_date AS "DUE DATE", '$2' AS "LATE FEE" FROM BOOKS_TRANSACTIONS;
C. SELECT member_id AS "MEMBER ID", due_date AS "DUE DATE", $2 AS "LATE FEE" FROM BOOKS_TRANSACTIONS;
D. SELECT member_id AS MEMBER_ID, due_date AS DUE_DATE, $2 AS LATE_FEE FROM BOOKS_TRANSACTIONS;

Answer: B

NEW QUESTION # 179
Examine the structure of the MARKS table:

Which two statements would execute successfully? (Choose two.)

A. SELECT student_name,SUM(subject1)FROM marksWHERE student_name LIKE 'R%';
B. SELECT student_name subject1FROM marksWHERE subject1 > AVG(subject1);
C. SELECT SUM(DISTINCT NVL(subject1,0)), MAX(subject1)FROM marksWHERE subject1 > subject2;
D. SELECT SUM(subject1+subject2+subject3)FROM marksWHERE student_name IS NULL;

Answer: C,D

NEW QUESTION # 180
Which two statements are true about the WHERE and HAVING clauses in a SELECT statement?

A. The WHERE clause can be used to exclude rows before dividing them into groups.
B. WHERE and HAVING clauses can be used in the same statement only if applied to different table columns.
C. The WHERE clause can be used to exclude rows after dividing them into groups
D. The HAVING clause can be used with aggregating functions in subqueries.
E. Aggregating functions and columns used in HAVING clauses must be specified in these SELECT list of a query.

Answer: A,E

Explanation:
In SQL, the WHERE and HAVING clauses are used to filter records; the WHERE clause is applied before grouping the records, while the HAVING clause is used after grouping the records, particularly when using aggregation functions.
Statement D is true because the HAVING clause is used to filter groups based on the result of aggregate functions. Therefore, any column or aggregate function appearing in the HAVING clause must also appear in the SELECT list of the query, unless it is used as part of an aggregate function.
Statement E is true because the WHERE clause is designed to filter rows before they are grouped into aggregate groups in a GROUP BY clause. This is a fundamental aspect of SQL that optimizes query performance by reducing the number of rows to be processed in the aggregate phase.
Statements A, B, and C are incorrect based on the following:
A is incorrect because the WHERE clause does not operate on groups but on individual rows before grouping.
B is misleading; while WHERE and HAVING can be used in the same statement, their usage is not restricted to different columns. They perform different functions (row-level filtering vs. group-level filtering).
C is incorrect because subqueries using aggregate functions typically do not use HAVING clauses; rather, HAVING is used in the outer query to filter the results of aggregates.

NEW QUESTION # 181
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