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NEW QUESTION # 216
Which statements are true regarding primary and foreign key constraints and the effect they can have on table data?
Answer: A,D,F
Explanation:
Regarding primary and foreign key constraints:
A . A table can have only one primary key but multiple foreign keys. This is true. A table is constrained to have only one primary key, which can consist of multiple columns, but can have several foreign keys referencing primary keys in other tables.
C . Primary key and foreign key constraints can be defined at both the column and table level. True. Constraints can be defined inline with the column definition or separately at the end of the table definition.
E . It is possible for child rows that have a foreign key to be deleted automatically from the child table at the time the parent row is deleted. This is also true if the foreign key is defined with the ON DELETE CASCADE option.
Options B, D, F, and G are incorrect:
B is incorrect because if a parent row is deleted, the child rows cannot remain without violating the integrity unless the foreign key is defined with ON DELETE SET NULL or similar behavior.
D is incorrect because both primary and foreign key constraints can be defined at both levels.
F is incorrect as the names of the foreign key columns do not need to match the primary key column names.
G is incorrect as a table can have multiple foreign keys.
NEW QUESTION # 217
Examine the data in the PRODUCTS table:
Examine these queries:
1. SELECT prod name, prod list
FROM products
WHERE prod 1ist NOT IN(10,20) AND category _id=1;
2. SELECT prod name, | prod _ list
FROM products
WHERE prod list < > ANY (10,20) AND category _id= 1;
SELECT prod name, prod _ list
FROM products
WHERE prod_ list <> ALL (10, 20) AND category _ id= 1;
Which queries generate the same output?
Answer: A
NEW QUESTION # 218
Examine this SQL statement
DELETE FROM employees e
WHERE EXISTS
(SELECT' dummy'
FROM emp history
WHERE employee_ id= e. employee id);
Which two are true?
Answer: A,B
Explanation:
For the provided DELETE statement with an EXISTS clause:
* Option B: The subquery is executed before the DELETE statement is executed.
* Subqueries with EXISTS are typically executed before the outer DELETE statement to determine which rows of the outer query satisfy the condition.
* Option D: The DELETE statement executes successfully even if the subquery selects multiple rows.
* The EXISTS condition is used to check for the existence of rows returned by the subquery, regardless of how many rows there are. It returns TRUE if the subquery returns at least one row.
Options A, C, and E are incorrect because:
* Option A: This statement is incorrect; the subquery is indeed a correlated subquery because it references the employee_id from the outer query (employees).
* Option C: This is incorrect because not all existing rows in the EMPLOYEES table will be deleted, only those for which an associated record exists in the emp_history table.
* Option E: While technically the subquery may be evaluated multiple times, it is only executed for those rows in EMPLOYEES that satisfy the condition of the EXISTS clause.
NEW QUESTION # 219
Examine the structure of the employees table.
There is a parent/child relationship betweenEMPLOYEE_IDandMANAGER_ID.
You want to display the last names and manager IDs of employees who work for the same manager asthe employee whoseEMPLOYEE_ID123.
Which query provides the correct output? A)
B)
C)
D)
Answer: A
NEW QUESTION # 220
Which three statements about roles are true?
Answer: E,F,G
Explanation:
Roles in Oracle Database are designed to simplify the management of privileges. The following statements about roles are true:
B: A single user can indeed be assigned multiple roles. This allows for easy management of user privileges as they can be grouped into roles, and these roles can be granted to users.
D: A single role can be assigned to multiple users. This is one of the primary purposes of roles, to provide an efficient way to grant the same set of privileges to different users.
G: Privileges are granted to a role using the GRANT statement. This allows the role to encapsulate the privileges which can then be granted to users.
The incorrect options are:
A: Roles cannot be assigned to other roles using the ALTER ROLE statement; they are granted to other roles using the GRANT statement.
C: Roles are not assigned to users using the ALTER USER statement; roles are granted to users using the GRANT statement.
E: Privileges are not assigned to a role using the ALTER ROLE statement; they are granted using the GRANT statement.
F: A role is not limited to being assigned to just one user; it can be assigned to multiple users.
Reference:
Oracle Documentation on Roles: Database Security Guide - Roles
Oracle Documentation on the GRANT statement: SQL Language Reference - GRANT
NEW QUESTION # 221
......
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