Quiz 1z0-071 - High Pass-Rate Valid Oracle Database SQL Mock Exam

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Oracle 1z0-071 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Retrieving Data Using SQL SELECT Statement	20%	- Column aliases, concatenation, literals and DISTINCT - Arithmetic operations and NULL handling - SELECT statement syntax and usage
Topic 2: Using Single-Row Functions to Customize Output	20%	- Nested functions usage - Character, number, and date functions
Topic 3: Restricting and Sorting Data	15%	- Substitution variables, DEFINE and VERIFY commands - WHERE clause and filtering conditions - ORDER BY clause and sorting rules - Operator precedence
Topic 4: Relational Database Concepts	10%	- ERD and SQL statement mapping - Theoretical and physical aspects of relational databases - Relationship between database and SQL
Topic 5: Managing Tables and Constraints		- Temporary and external tables - Constraints: primary key, foreign key, unique, check, not null - Data types, creating/altering/dropping tables
Topic 6: Using Subqueries to Solve Queries		- Single-row and multi-row subqueries - Correlated subqueries for update/delete
Topic 7: Conversion Functions and Conditional Expressions	10%	- NVL, NULLIF, COALESCE and CASE expressions - TO_CHAR, TO_NUMBER, TO_DATE functions - Implicit and explicit data type conversion
Topic 8: Managing Indexes, Synonyms and Sequences		- Create and use synonyms - Create and maintain indexes - Create and use sequences
Topic 9: Displaying Data from Multiple Tables	15%	- Equijoins and non-equijoins - Self-joins and outer joins - Cartesian products
Topic 10: Using SET Operators		- UNION, UNION ALL, INTERSECT, MINUS operators - Ordering results with set operations
Topic 11: Controlling User Access		- Roles, granting and revoking privileges - System and object privileges
Topic 12: Aggregating Data Using Group Functions	10%	- SUM, AVG, COUNT, MAX, MIN functions - GROUP BY and HAVING clauses - Handling NULLs in group functions
Topic 13: Manipulating Data and Managing Transactions		- INSERT, UPDATE, DELETE, MERGE statements - Multi-table inserts - Transaction control: COMMIT, ROLLBACK, SAVEPOINT
Topic 14: Using Data Dictionary Views		- Retrieve metadata and object information
Topic 15: Working with Time Zones and Date/Time Data		- TIMESTAMP, INTERVAL data types - Time zone conversion functions
Topic 16: Managing Views		- Create, modify and drop views - Updatable and read-only views

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Oracle Database SQL Sample Questions (Q401-Q406):

NEW QUESTION # 401
Which three privileges can be restricted to a subset of columns in a table? (Choose three.)

A. INDEX
B. UPDATE
C. REFERENCES
D. SELECT
E. DELETE
F. INSERT
G. ALTER

Answer: B,D,E

Explanation:
Explanation

NEW QUESTION # 402
View the exhibit and examine the structure in ORDERS and ORDER_ITEMS tables.

You need to create a view that displays the ORDER_ID, ORDER_DATE, and the total number of items in each order.
Which CREATE VIEW statement would create the view successfully?

A. CREATE OR REPLACE VIEW ord_vuAS SELECT o.order_id, o.order_date,
COUNT(i.line_item_id)||'NO OF ITEMS'FROM orders o JOIN order_items iON (o.order_id = i.order_id)GROUP BY o.order_id,o.order_dateWHITH CHECK OPTION;
B. CREATE OR REPLACE VIEW ord_vuAS SELECT o.order_id, o.order_date,
COUNT(i.line_item_id)"NO OF ITEMS"FROM orders o JOIN order_items iON (o.order_id = i.order_id)GROUP BY o.order_id,o.order_date;
C. CREATE OR REPLACE VIEW ord_vu (order_id, order_date)AS SELECT o.order_id, o.order_date, COUNT(i.line_item_id)"NO OF ITEMS"FROM orders o JOIN order_items iON (o.order_id = i.order_id)GROUP BY o.order_id, o.order_date;
D. CREATE OR REPLACE VIEW ord_vuAS SELECT o.order_id, o.order_date,
COUNT(i.line_item_id)FROM orders o JOIN order_items iON (o.order_id = i.order_id)GROUP BY o.order_id,o.order_date;

Answer: B

NEW QUESTION # 403
which three statements are true about indexes and their administration in an Oracle database?

A. A DROP INDEX statement always prevents updates to the table during the drop operation
B. A DESCENDING INDEX IS A type of function-based index
C. IF a query filters on an indexed column then it will always be used during execution of query
D. AN INDEX CAN BE CREATED AS part of a CREATE TABLE statement
E. The same table column can be part of a unique and non-unique index
F. AN INVISIBLE INDEX is not maintained when DML is performed on its underlying table.

Answer: D,E,F

Explanation:
A). True, a single table column can be included in both a unique index and a non-unique index, provided they are different indexes.
D). True, an invisible index is maintained during DML operations, which means it is updated when insert, update, or delete operations are performed on the table. However, it is not used by the optimizer by default for query execution unless explicitly hinted or the session is altered to consider invisible indexes.
E). True, an index can be specified in the CREATE TABLE statement using the INDEX clause to create an index on a specific column at the time of table creation.
B, C, and F are not correct: B. A descending index is simply an index that is sorted in descending order, not a type of function-based index. C. A DROP INDEX

NEW QUESTION # 404
Which three statements are true about defining relations between tables in a relational database?

A. Unique key columns allow null values
B. Foreign key columns allow null values.
C. Every primary or unique key value must refer to a matching foreign key value.
D. Every foreign key value must refer to a matching primary or unique key value.
E. Primary key columns allow null values.

Answer: B,D

Explanation:
A). Correct. Foreign key constraints can be nullable. This allows the possibility of a row not having a link to another table. B. Incorrect. Unique key constraints do not allow multiple rows to have null values unless the constraint is defined on multiple columns. C. Incorrect. Primary key columns must be NOT NULL and unique across the table. D. Incorrect. Primary or unique key values do not refer to foreign keys; it's the foreign keys that refer to primary or unique keys. E. Correct. Foreign key constraints enforce referential integrity by requiring that each foreign key value matches a primary or unique key value in the related table.
These are standard rules in relational databases, which can be confirmed in the Oracle Database Concepts Guide.

NEW QUESTION # 405
Which two are true about granting privilege on objects?

A. The owner of an object acquires all object privilege on that object by default
B. An object privilege can be granted to a role only by the owner of that object
C. An object privilege can be granted to other users only by the owner of that object
D. The WITH GRANT OPTION clause can be used only by DBA users
E. A table owner must grant the REFERENCES privilege to allow other users to create FOREIGN KEY constraints using that table

Answer: A,E

Explanation:
C . True, the owner of an object automatically has all object privileges for that object by default. This is an inherent property of the object owner in Oracle.
D . True, to allow the creation of foreign key constraints that reference a particular table, the owner of the table must grant the REFERENCES privilege on the key columns to other users or roles.
A, B, and E are not correct because: A. Object privileges can be granted to a role by any user with the appropriate permissions, not only by the owner. B. Object privileges can also be granted by users who have been given the privileges with the WITH GRANT OPTION, not just by the owner. E. The WITH GRANT OPTION is not limited to DBA users; it can be used by any user who has the privilege to grant a specific object privilege.
Reference:
Oracle documentation on object privileges: Oracle Database SQL Language Reference Oracle documentation on the REFERENCES privilege: Oracle Database Security Guide

NEW QUESTION # 406
......

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