Which two statements are true about external tables?
Answer : C, D
For external tables in Oracle:
C . DML statements cannot be used on them: External tables are read-only in Oracle. They allow access to data in external sources as if it were within a table in the database, but they do not support DML operations (INSERT, UPDATE, DELETE).
D . Their data can be retrieved by using only SQL or PL/SQL: You can query the data in external tables using SQL or PL/SQL, just as you would with regular database tables.
Incorrect options are:
A: You cannot create indexes directly on external tables.
B: External tables cannot be populated using the CREATE TABLE AS SELECT command since they are primarily meant for accessing data stored outside the database.
E: Only the metadata of an external tables is stored in the database; the actual data remains in external files.
An Oracle database server session has an uncommitted transaction in progress which updated 5000 rows
in a table.
In which three situations does the transact ion complete thereby committing the updates?
Answer : A, C, F
For situations where the transaction would complete by committing the updates:
A . When the session logs out successfully: When a user session logs out, Oracle automatically commits any outstanding transactions.
C . When a CREATE INDEX statement is executed successfully in the same session: Most DDL statements, including CREATE INDEX, cause an implicit commit before and after they are executed.
F . When a DBA issues a successful SHUTDOWN TRANSACTIONAL statement: This type of shutdown ensures that active transactions are either committed or rolled back. If a COMMIT is then issued explicitly, it would be redundant but emphasizes the transaction completion.
Incorrect options:
B: SHUTDOWN IMMEDIATE will roll back transactions, not commit them.
D: A COMMIT in one session cannot affect the transaction state of another session; each session is isolated in terms of transaction management.
E: If a CREATE TABLE AS SELECT statement executes unsuccessfully, no implicit commit is performed; the statement failure means the transaction state remains unchanged.
For each employee in department 90 you want to display:
1. their last name
2. the number of complete weeks they have been employed
The output must be sorted by the number of weeks, starting with the longest serving employee
first.Which statement will accomplish this?
Answer : D
D . True. The TRUNC function, when applied to the difference between SYSDATE and hire_date divided by 7, will return the number of complete weeks of employment. The ORDER BY tenure DESC will sort the result in descending order, starting with the longest-serving employee.
A is incorrect because it does not include the DESC keyword necessary to start with the longest-serving employee. B is incorrect because ROUND could result in rounding up to the next week, which does not give the number of complete weeks. C is incorrect because the division is done by 17 instead of 7, which is likely a typo, and ROUND is used instead of TRUNC.
Examine the description of the PRODUCT_ STATUS table:
The STATUS column contains the values IN STOCK or OUT OF STocK for each row.
Which two queries will execute successfully?
Answer : D
The || operator is used in Oracle SQL to concatenate strings, and the q quote operator allows you to use alternative quoting mechanisms to avoid conflicts with single quotes within a string.
In options A, B, C, D, E, and F, the q-quote operator is used in different ways to define string literals.
The correct use of the q quote operator requires the format q'[...]', where [...] is the quote delimiter of your choice and can be any single character such as {, [, (, <, or others.
Option D is the correct answer because it follows the correct syntax for the q quote operator and concatenates the literal string correctly with the value of PROD_ID.
Here is the corrected syntax from option D:
SELECT PROD_ID || q'[('s not available)]' 'CURRENT AVAILABILITY' FROM product_status WHERE status = 'OUT OF STOCK';
This query will execute successfully and is the only one that correctly uses the q quote operator.
ALTER TABLE emp MODIFY CONSTRAINT emp_fkey ENABLE;
Which two are true?
Answer : E, F
E . True. The deptno column in the emp table can contain null values unless explicitly constrained not to, which is not the case here.
F . True. The three statements can execute successfully in the order shown. The foreign key constraint in the dept table is referring to the emp table which does not yet exist, but this is not a problem because it is not immediately enabled. The emp table is created next with a disabled foreign key constraint referencing the already created dept table. Finally, the foreign key constraint on emp is enabled after both tables are in place.
A is incorrect because the MGR column can contain NULL values as there is no NOT NULL constraint applied to it. B is incorrect because the CREATE TABLE EMP statement contains a disabled foreign key, so it can be created before CREATE TABLE DEPT. C and D are incorrect because foreign key constraints do not need to be removed and added later for the tables to be created successfully; they can be managed as shown in the provided statements.
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