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Oracle Database SQL Sample Questions (Q231-Q236):

NEW QUESTION # 231
Which two statements are true regarding a SAVEPOINT? (Choose two.)

A. Rolling back to a SAVEPOINT can undo a TRUNCATE statement
B. A SAVEPOINT does not issue a COMMIT
C. Only one SAVEPOINT may be issued in a transaction
D. Rolling back to a SAVEPOINT can undo a DELETE statement
E. Rolling back to a SAVEPOINT can undo a CREATE INDEX statement

Answer: B,D

Explanation:
Explanation/Reference:

NEW QUESTION # 232
Which three statements are true about the Oracle join and ANSI Join syntax?

A. The Oracle join syntax supports natural joins.
B. The Oracle join syntax only supports right outer joins,
C. The Oracle join syntax performs better than the SQL:1999 compliant ANSI join syntax.
D. The Oracle join syntax performs less well than the SQL:1999 compliant ANSI Join Answer.
E. The SQL:1999 compliant ANSI join syntax supports creation of a Cartesian product of two tables.
F. The Oracle join syntax supports creation of a Cartesian product of two tables.
G. The SQL:1999 compliant ANSI join syntax supports natural joins.

Answer: E,F,G

Explanation:
Regarding Oracle join and ANSI join syntax:
B . The Oracle join syntax supports the creation of a Cartesian product of two tables. This is true. In Oracle, if you list tables in the FROM clause without a join condition, it creates a Cartesian product.
C . The SQL:1999 compliant ANSI join syntax supports natural joins. This is true. ANSI syntax supports natural joins, which join tables based on columns with the same names in the joined tables.
F . The SQL:1999 compliant ANSI join syntax supports the creation of a Cartesian product of two tables. This is true. The ANSI standard allows for Cartesian products when tables are listed in the FROM clause without a join condition.
Options A, D, E, and G are incorrect:
A is incorrect because the Oracle join syntax supports all types of joins, including right outer joins.
D is incorrect because Oracle's proprietary join syntax does not use the term "natural join." E is incorrect because there is no inherent performance difference between Oracle join syntax and ANSI join syntax; performance depends on how the query is written and how the database optimizer handles it.
G is incorrect for the same reason as E.

NEW QUESTION # 233
You and your colleague Andrew have these privileges on the EMPLOYEE_RECORDS table:
1. SELECT
2. INSERT
3. UPDATE
4. DELETE
You connect to the database instance an perform an update to some of the rows in EMPLOYEE_RECORDS, but don't commit yet.
Andrew connects to the database instance and queries the table
No othet user are accessing the table
Which two statements ate true at this point?

A. Andrew will be able to see the changes you habe made
B. Andrew will be able to modify any rows in the table that have not been modified by your transaction
C. Andrew will be unable to see the changes you have made
D. Andrew will be unable to perform any INSERT, UPDATE of DELETE on the teble
E. Andrew will be able to SELECT from the table, but be unable to modify any existing rows.

Answer: B,C

Explanation:
In Oracle Database, when a transaction is not committed, the changes it makes are not visible to other sessions.
This is due to Oracle's read consistency model, which means that Andrew will not be able to see the changes you have made until they are committed.
Option A is correct because, in Oracle, another session can modify rows that have not been locked by an uncommitted transaction.
Option C is incorrect because, as per Oracle's read consistency, the changes made by an uncommitted transaction are not visible to other users.
Option D is incorrect because Andrew can perform INSERT, UPDATE, or DELETE operations on the rows that you have not modified.
Option E is incorrect because, while Andrew will be able to SELECT from the table, he will still be able to modify rows that are not locked by your uncommitted update.
References:
* Oracle Documentation on Transactions: Transactions
* Oracle Documentation on Read Consistency: Read Consistency

NEW QUESTION # 234
Examine these statements:
CREATE TABLE dept (
deptno NUMBER PRIMARY KEY,
diname VARCHAR2(10) ,
mgr NUMBER ,
CONSTRAINT dept_fkey FOREIGN KEY(mgr) REFERENCES emp (empno));
CREATE TABLE emp (
Empno NUMBER PRIMARY KEY,
Ename VARCHAR2 (10) ,
deptno NUMBER,
CONSTRAINT emp_fkey FOREIGN KEY (deptno) REFERENCES dept (deptno) DISABLE);
ALTER TABLE emp MODIFY CONSTRAINT emp_fkey ENABLE;
Which two are true?

A. All three statements execute successfully in the order shown
B. The DEFT FKEY constraint definition must be removed from the CREATE TABLE DEF statement.and be added with an AITER TABLE statement once both tables are created, for the two CREATE TABLE statements
to execute successfully in the order shown.
C. The MGR column in the DEPT table will not be able to contain NULL values.
D. The CREATE TABLE EMP statement must precede the CREATE TABLE DEPT statement for all threestatements to execute successfully.
E. The Deptno column in the emp table will be able to contain nulls values.
F. Both foreign key constraint definitions must be removed from the CREATE TABLE statements, andbe added with ALTER TABLE statements once both tables are created, for the two CREATE TABLEstatements to
execute successfully in the order shown.

Answer: B,E

NEW QUESTION # 235
Which two are true about unused columns?

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

Answer: A,C

NEW QUESTION # 236
......

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