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Oracle 1z0-071 Certification Exam consists of 73 multiple-choice questions that must be completed within 100 minutes. 1z0-071 exam covers a range of topics, including SQL fundamentals, data retrieval, data manipulation, table creation, and table maintenance. Candidates must demonstrate a deep understanding of SQL programming concepts and be able to apply their knowledge to real-world scenarios.

Oracle Database SQL Sample Questions (Q91-Q96):

NEW QUESTION # 91
You execute this query:

What is the result?

Answer: C

Explanation:
Explanation/Reference:


NEW QUESTION # 92
Which three privileges can be restricted to a subset of columns in a table?

Answer: E,F,G

Explanation:
B: True. The REFERENCES privilege can be granted on specific columns within a table. This is necessary when a user needs to define foreign key constraints that reference those particular columns.
C: True. The UPDATE privilege can be granted on specific columns, allowing users to update only designated columns within a table. This is useful for restricting write access to sensitive or critical data within a table.
F: True. The INSERT privilege can also be granted on specific columns, meaning a user can be permitted to insert data into only certain columns of a table. This helps in maintaining data integrity and controlling access to data fields based on user roles.


NEW QUESTION # 93
Examine the description of EMPLOYEES table:
Which three queries return all rows for which SALARY+COMMISSION is greate than 20000?

Answer: C,E,F

Explanation:
In Oracle Database 12c, when dealing with NULL values in arithmetic expressions, the functions NVL, NVL2
, and equivalent techniques using NULLIF or arithmetic operations with NULL can be crucial.
* Option A: SELECT * FROM employees WHERE salary + NULLIF(commission, 0) >= 20000;
* NULLIF(value1, value2) returns NULL if value1 is equal to value2, otherwise it returns value1.
In this case, if commission is NULL, it treats it as 0.
* This query correctly adds salary and commission (assuming 0 when commission is NULL) and checks if the total is at least 20000.
* Option B: SELECT * FROM employees WHERE salary + NVL2(commission, commission, 0) >=
20000;
* NVL2(expr1, expr2, expr3) returns expr2 if expr1 is not NULL; otherwise, it returns expr3.
Here, if commission is not NULL, it uses commission, otherwise 0.
* This condition correctly calculates salary + commission (assuming commission as 0 if it is NULL) and checks if the total is at least 20000.
* Option D: SELECT * FROM employees WHERE salary + NVL(commission, 0) >= 20000;
* NVL(expr1, expr2) returns expr2 if expr1 is NULL; otherwise, it returns expr1. This query treats commission as 0 if it is NULL.
* It correctly sums salary and commission and compares the result against 20000.
Options C, E, and F contain either syntax errors or logical errors in handling NULLs and comparisons.


NEW QUESTION # 94
Which three statements about roles are true? (Choose three.)

Answer: B,E,G

Explanation:
Use the GRANT statement to assign access privileges and roles.
Reference:
http://archive.dnnsoftware.com/docs/85/administrators/security/roles/assign-multiple-users-to-role.html
https://www.dnnsoftware.com/docs/administrators/user-accounts/assign-user-to-multiple-roles.html
https://www.ibm.com/support/knowledgecenter/en/SSGU8G_11.70.0/com.ibm.sqls.doc/ids_sqs_0828.htm


NEW QUESTION # 95
You execute this command:
TRUNCATE TABLE dept;
Which two are true?

Answer: B,C

Explanation:
When using the TRUNCATE TABLE command in Oracle, several aspects of the table's structure and associated database objects are impacted. Here's an explanation of each option:
* A: Incorrect. TRUNCATE TABLE does not drop triggers associated with the table; they remain defined.
* B: Correct. Indexes on the table are retained and not dropped when you truncate a table. However, if the index is a domain index, it may be dropped depending on its type.
* C: Correct. Integrity constraints such as primary keys, foreign keys, etc., are retained unless they are on a disabled state where truncation can lead to constraint being dropped.
* D: Incorrect. A TRUNCATE TABLE operation cannot be rolled back. It is a DDL (Data Definition Language) operation and commits automatically.
* E: Incorrect. The TRUNCATE TABLE operation deallocates the space used by the data unless the REUSE STORAGE clause is specified.
* F: Incorrect. TRUNCATE TABLE operation removes all the rows in a table and does not log individual row deletions, thus FLASHBACK TABLE cannot be used to retrieve the data.


NEW QUESTION # 96
......

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