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Oracle 1z1-071 Exam Syllabus Topics:

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

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Oracle Database SQL Sample Questions (Q176-Q181):

NEW QUESTION # 176
Which three statements are true? (Choose three.)

A. The USER_CONS_COLUMNSview should be queried to find the names of columns to which constraints apply.
B. Both USER_OBJECTSand CATviews provide the same information about all objects that are owned by the user.
C. The data dictionary is created and maintained by the database administrator.
D. The usernames of all the users including database administrators are stored in the data dictionary.
E. Views with the same name but different prefixes, such as DBA, ALLand USER, reference the same base tables from the data dictionary.
F. The data dictionary views consist of joins of dictionary base tables and user-defined tables.

Answer: A,D,E

Explanation:
Explanation
Explanation/Reference:
References:
https://docs.oracle.com/cd/B10501_01/server.920/a96524/c05dicti.htm

NEW QUESTION # 177
Which statements are true? (Choose all that apply.)

A. The data dictionary views consists of joins of dictionary base tables and user-defined tables.
B. The data dictionary is created and maintained by the database administrator.
C. Views with the same name but different prefixes, such as DBA, ALL and USER, use the same base tables from the data dictionary.
D. Both USER_OBJECTS and CAT views provide the same information about all the objects that are owned by the user.
E. The USER_CONS_COLUMNS view should be queried to find the names of the columns to which a constraint applies.
F. The usernames of all the users including the database administrators are stored in the data dictionary.

Answer: C,E,F

Explanation:
Explanation
References:
https://docs.oracle.com/cd/B10501_01/server.920/a96524/c05dicti.htm

NEW QUESTION # 178
Which three statements are true about views in an Oracle Database?

A. A SELECT statement cannot contain a WHERE clause when querying a view containing a WHERE clause in its defining query.
B. Views can join tables only if they belong to the same schema.
C. A view can be created that refers to a non-existent table in its defining query.
D. Views have no object number.
E. Views have no segment.
F. Rows inserted into a table using a view are retained in the table if the view is dropped.

Answer: B,C,D

NEW QUESTION # 179
View the Exhibit and examine the structure of the PRODUCT_INFORMATION table.

You want to see the product names and the date of expiration of warranty for all the products, if the product is purchased today. The products that have no warranty should be displayed at the top and the products with maximum warranty period should be displayed at the bottom.
Which SQL statement would you execute to fulfill this requirement?

A. SELECT product_name, SYSDATE+warranty_period AS "Warranty expire date"FROM product_informationWHERE warranty_period > SYSDATE
B. SELECT product_name, SYSDATE+warranty_period AS "Warranty expire date"FROM product_informationORDER BY SYSDATE-warranty_period
C. SELECT product_name, SYSDATE+warranty_period AS "Warranty expire date"FROM product_informationORDER BY SYSDATE+warranty_period
D. SELECT product_name, SYSDATE+warranty_period AS "Warranty expire date"FROM product_informationORDER BY SYSDATE

Answer: C

NEW QUESTION # 180
Examine the description of the EMPLOYEES table:

Which statement will fail?

A. SELECT department_id, COUNT (*)
FROM employees
HAVING department_ id <> 90 AND COUNT(*) >= 3
GROUP BY department_id;
B. SELECT department_id, COUNT (*)
FROM employees
WHERE department_ id <> 90 AND COUNT(*) >= 3
GROUP BY department_id;
C. SELECT department_id, COUNT(*)
FROM employees
WHERE department_id <> 90 HAVING COUNT(*) >= 3
GROUP BY department_id;
D. SELECT department_id, COUNT(*)
FROM employees
WHERE department_id <> 90 GROUP BY department_id
HAVING COUNT(*) >= 3;

Answer: B

Explanation:
The statement that will fail is B. In Oracle SQL, the WHERE clause cannot contain aggregate functions directly. The HAVING clause is used instead to apply conditions that involve aggregates, but it is applied after the GROUP BY clause.
A . While the HAVING clause is used before the GROUP BY clause which is not standard SQL syntax, Oracle SQL may still execute it successfully due to its flexibility in syntax.
B . This statement will fail because it uses an aggregate function, COUNT(*), in the WHERE clause, which is not allowed. The correct approach is to use the HAVING clause to filter the results of aggregate functions after the GROUP BY clause.
C . This statement is correct; it places the HAVING clause after the GROUP BY clause, applying the filter on the aggregated count.
D . This is a correctly constructed statement with the WHERE clause filtering individual records before grouping, and the HAVING clause filtering groups based on the aggregate function.
Reference:
Oracle Database SQL Language Reference, 12c Release 1 (12.1): "WHERE Clause" Oracle Database SQL Language Reference, 12c Release 1 (12.1): "HAVING Clause"

NEW QUESTION # 181
......

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