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Oracle Database SQL Sample Questions (Q166-Q171):

NEW QUESTION # 166
Examine the description of the CUSTOMERS table:

CUSTNO is the PRIMARY KEY.
You must determine if any customers' details have been entered more than once using a different CUSTNO, by listing all duplicate names.
Which two methods can you use to get the required result?

A. FULL OUTER JOIN with self join
B. LEFT OUTER JOIN with self join
C. subquery
D. self join
E. RIGHT OUTER JOIN with self join

Answer: C,D

NEW QUESTION # 167
Which three statements are true about inner and outer joins? (Choose three.)

A. Outer joins can be used when there are multiple join conditions on two tables
B. A full outer join must use Oracle syntax
C. Outer joins can only be used between two per query
D. An inner join returns matched rows
E. A full outer join returns matched and unmatched rows
F. A left or right outer join returns only unmatched rows

Answer: A,D,E

Explanation:
https://www.studytonight.com/dbms/joining-in-sql.php

NEW QUESTION # 168
In the customers table, the CUST_CITY column contains the value 'Paris' for the
CUST_FIRST_NAME 'Abigail'.
Evaluate the following query:

What would be the outcome?

A. Abigail PA
B. Abigail Pa
C. An error message
D. Abigail IS

Answer: B

NEW QUESTION # 169
In the EMPLOYEES table there are 1000 rows and employees are working in the company for more than 10 years.
Evaluate the following SQL statement:

What would be the result?

A. It gives an error because NVL function cannot be used with UPDATE.
B. It executes successfully but no rows updated.
C. It gives an error because multiple NVL functions are used in an expression.
D. It executes successfully and updates the records of those employees who have been working in the company for more than 600 days.

Answer: D

NEW QUESTION # 170
Which three statements are true about GLOBAL TEMPORARY TABLES?

A. A trigger can be created on a GLOBAL TEMPORARY TABLE
B. A GLOBAL TEMPORARY TABLE cannot have PUBLIC SYNONYM.
C. A GLOBAL TEMPORARY TABLE can have only one index.
D. A GLOBAL TEMPORARY TABLE can have multiple indexes
E. A GLOBAL TEMPORARY TABLE can be referenced in the defining query of a view.
F. Data Manipulation Language (DML) on GLOBAL TEMPORARY TABLES generates no REDO.

Answer: D,E,F

Explanation:
A . Incorrect. There is no such restriction in Oracle that a global temporary table cannot have a public synonym. B. Correct. Global temporary tables can have more than one index, just like permanent tables. C. Correct. Global temporary tables can be referenced in the defining query of a view. However, any data selected by the view will be session-specific if it comes from the global temporary table. D. Correct. DML operations on global temporary tables do not generate redo log entries for the data changes; however, undo information for these tables is stored in the undo tablespace and can generate redo entries. E. Incorrect. As stated in B, global temporary tables can have more than one index. F. Correct. Triggers can be created on global temporary tables.
These properties are documented in the Oracle Database SQL Language Reference and Oracle Database Concepts Guide.

NEW QUESTION # 171
......

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