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Oracle 1z1-071 Exam Syllabus Topics:

Section	Objectives
Subqueries and Advanced SQL	- Single-row and multi-row subqueries - Correlated subqueries and nested queries
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
SQL Functions	- Single-row functions 1. Character, numeric, date functions - Conversion and conditional functions 1. TO_CHAR, TO_NUMBER, CASE expressions
Relational Database Concepts	- Tables, rows, columns, and relational model basics - Data types and database objects overview
Data Manipulation and Schema Objects	- DDL operations 1. CREATE, ALTER, DROP tables and constraints - DML operations 1. INSERT, UPDATE, DELETE, MERGE

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Oracle Database SQL Sample Questions (Q30-Q35):

NEW QUESTION # 30
Which statements are correct regarding indexes? (Choose all that apply.)

A. For each DML operation performed, the corresponding indexes are automatically updated.
B. A non-deferrable PRIMARY KEY or UNIQUE KEY constraint in a table automatically creates a unique index.
C. When a table is dropped, the corresponding indexes are automatically dropped.
D. Indexes should be created on columns that are frequently referenced as part of an expression.

Answer: A,B,C

NEW QUESTION # 31
Which three statements are true about performing Data Manipulation Language (DML) operations on a view In an Oracle Database?

A. Views cannot be used to query rows from an underlying table if the table has a PRIPOARY KEY and the PRIMARY KEY columns are not referenced in the defining query of the view.
B. The WITH CHECK clause has no effect when deleting rows from the underlying table through the view.
C. Views cannot be used to add on modify rows in an underlying table if the defining query of the view contains aggregating functions.
D. Views cannot be used to add or modify rows in an underlying table if the defining query of the view contains the DISTINCT keyword.
E. Insert statements can always be done on a table through a view.
F. Views cannot be used to add rows to an underlying table if the table has columns with NOT NULL constraints lacking default values which are not referenced in the defining query of the view.

Answer: C,D,F

NEW QUESTION # 32
Which two statements are true about outer Joins?

A. An outer join is used to retrieve only the rows that do not meet the join condition.
B. The IN operator cannot be used in a condition that Involves an outer join.
C. A condition representing an outer join cannot be linked to another condition using the or logical operator.
D. The outer join operator (+) can be used on both sides of the join condition in an outer join.
E. The outer join operator (+) is used next to the column of the table without the matching rows.

Answer: C,E

Explanation:
Regarding the usage and rules of outer joins in SQL, specifically Oracle SQL:
* D. A condition representing an outer join cannot be linked to another condition using the OR logical operator: In SQL, when using the Oracle-specific (+) notation for outer joins, it is not permitted to combine this condition with another using the OR operator. The use of (+) imposes restrictions to ensure the join logic is correctly interpreted.
* E. The outer join operator (+) is used next to the column of the table without the matching rows:
The (+) symbol in Oracle's SQL syntax denotes the table that should include "null" where data does not exist to satisfy the join condition, effectively including rows that do not have a match in the joined table.
Incorrect options:
* A: The (+) operator cannot be used on both sides of a condition within the same join; it can only appear on one side to define which side of the join is the outer part.
* B: An outer join is used to retrieve all rows from one table and the matched rows from the other table; it does not solely retrieve rows that do not meet the join condition.
* C: The IN operator can be used in conditions involving an outer join, although specific rules and behaviors need to be considered depending on the SQL version and implementation.

NEW QUESTION # 33
Choose the best answer.
Examine the description of the EMPLOYEES table:

Which query is valid?

A. SELECT depe_id,join_date,SUM(salary) FROM employees GROUP BY dept_id:
B. SELECT dept_id,AVG(MAX(salary)) FROM employees GROUP BY dapt_id;
C. SELECT dept_id, join_date,SUM(salary) FROM employees GROUP BY dept_id, join_date;
D. SELECT dept_id,MAX(AVG(salary)) FROM employees GROUP BY dept_id;

Answer: C

Explanation:
In Oracle 12c SQL, the GROUP BY clause is used to arrange identical data into groups with the GROUP BY expression followed by the SELECT statement. The SUM() function is then used to calculate the sum for each grouped record on a specific column, which in this case is the salary column.
Option A is valid because it correctly applies the GROUP BY clause. Both dept_id and join_date are included in the SELECT statement, which is a requirement when using these columns in conjunction with the GROUP BY clause. This means that the query will calculate the sum of salaries for each combination of dept_id and join_date. It adheres to the SQL rule that every item in the SELECT list must be either an aggregate function or appear in the GROUP BY clause.
Option B is invalid due to a typo in SELECT depe_id and also because it ends with a colon rather than a semicolon.
Option C is invalid because you cannot nest aggregate functions like MAX(AVG(salary)) without a subquery.
Option D is invalid for the same reason as option C, where it tries to nest aggregate functions AVG(MAX(salary)), which is not allowed directly in SQL without a subquery.
For further reference, you can consult the Oracle 12c documentation, which provides comprehensive guidelines on how to use the GROUP BY clause and aggregate functions like SUM():
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): GROUP BY Clause
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): Aggregate Functions

NEW QUESTION # 34
The PRODUCT_INFORMATION table has a UNIT_PRICE column of data type NUMBER(8, 2).
Evaluate this SQL statement:
SELECT TO_CHAR(unit_price,'$9,999') FROM PRODUCT_INFORMATION;
Which two statements are true about the output?

A. A row whose UNIT_PRICE column contains the value 1023.99 will be displayed as $1,024.
B. A row whose UNIT_PRICE column contains the value 10235.99 will be displayed as #####
C. A row whose UNIT_PRICE column contains the value 1023.99 will be displayed as $1,023.
D. A row whose UNIT_PRICE column contains the value 10235.99 will be displayed as $1,023.
E. A row whose UNIT_PRICE column contains the value 10235.99 will be displayed as $1,0236.

Answer: A,B

NEW QUESTION # 35
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