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Oracle Database SQL Sample Questions (Q87-Q92):

NEW QUESTION # 87
View the Exhibit and examine the structure of ORDERS and CUSTOMERS tables. (Choose the best answer.)

You executed this UPDATE statement:

Which statement is true regarding the execution?

A. It would not execute because a SELECT statement cannot be used in place of a table name.
B. It would execute and restrict modifications to the columns specified in the SELECT statement.
C. It would not execute because a subquery cannot be used in the WHERE clause of an UPDATE statement.
D. It would not execute because two tables cannot be referenced in a single UPDATE statement.

Answer: B

NEW QUESTION # 88
The first DROP operation is performed on PRODUCTS table using this command:
DROP TABLE products PURGE;
Then a FLASHBACK operation is performed using this command:
FLASHBACK TABLE products TO BEFORE DROP;
Which is true about the result of the FLASHBACK command?

A. It is not possible to recover the table structure, data, or the related indexes.
B. It recovers the table structure, data, and the indexes.
C. It recovers the table structure and data but not the related indexes.
D. It recovers only the table structure.

Answer: A

Explanation:
References:
https://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_9003.htm

NEW QUESTION # 89
Examine the business rule:
Each student can take up multiple projects and each project can have multiple students.
You need to design an Entity Relationship Model (ERD) for optimal data storage and allow
for generating reports in this format: STUDENT_ID FIRST_NAME LAST_NAME PROJECT_ID PROJECT_NAME PROJECT_TASK
Which two statements are true in this scenario?

A. STUDENT_ID must be the primary key in the STUDENTS entity and foreign key in the projects entity.
B. PROJECT_ID must be the primary key in the projects entity and foreign key in the STUDENTS entity.
C. An associative table must be created with a composite key of STUDENT_ID andPROJECT_ID; which is the foreign key linked to theSTUDENTSandPROJECTSentities.
D. The ERD must have a1:M relationship between the students and projects entitles.
E. The ERD must have a M:M relationship between the students and projects entities that must be resolved into 1:M relationships.

Answer: B,C

NEW QUESTION # 90
Which two are true about unused columns?

A. A foreign key column cannot be set to unused.
B. Unused columns retain their data until they are dropped
C. A query can return data from unused columns, but no DML is possible on those columns.
D. A primary key column cannot be set to unused.
E. The DESCRIBE command displays unused columns
F. Once a column has been set to unused, a new column with the same name can be added to the table.

Answer: B,F

Explanation:
Unused columns are a feature in Oracle that allows a column to be marked as unused without immediately dropping it from the table structure. The key points for each option are:
A: The DESCRIBE command does not display unused columns. These columns are also not visible in user_tab_cols but are visible in user_unused_col_tabs.
B: Primary key columns can be set to unused, but you must drop the primary key constraint before doing so.
C: Once a column is marked as unused, it is not possible to query it, and Oracle will not allow DML operations on that column.
D: This is true. Once a column is set to unused, you can add a new column with the same name because Oracle essentially considers the unused column as removed from the table.
E: Just like primary key columns, a foreign key column can be marked as unused, but you must drop the foreign key constraint first.
F: This is true. Unused columns retain their data until the column is dropped using the DROP UNUSED COLUMNS command.
References:
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "ALTER TABLE"
* Oracle Database Administrator's Guide, 12c Release 1 (12.1)

NEW QUESTION # 91
Which three statements are true regarding subqueries? (Choose three.)

A. Only one column or expression can be compared between the main query and subquery.
B. Multiple columns or expressions can be compared between the main query and subquery.
C. Subqueries can contain GROUP BY and ORDER BYclauses.
D. Subqueries can contain ORDER BYbut not the GROUP BYclause.
E. Main query and subquery must get data from the same tables.
F. Main query and subquery can get data from different tables.

Answer: B,C,F

Explanation:
Explanation/Reference:
References:
http://docs.oracle.com/javadb/10.6.2.1/ref/rrefsqlj13658.html

NEW QUESTION # 92
......

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Pass Guaranteed Quiz 2025 Oracle Latest 1z0-071: Sample Oracle Database SQL Questions Answers

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Oracle Database SQL Sample Questions (Q87-Q92):

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