This title motivates users to test their knowledge of the Oracle DEFAULT Constraint, using high-relevance keywords for SEO optimization.

Progress

True / False

In Oracle, a DEFAULT constraint is used to provide a default value for a column when no value is specified during an insert operation.

True False

The DEFAULT constraint automatically assigns a specified value to a column if no value is provided during an insert operation.

True / False

The DEFAULT value for a column in Oracle must be a constant expression.

True False

The DEFAULT value must be a constant expression and cannot be a subquery or a function that returns varying results.

True / False

In Oracle, you can define a DEFAULT value for any data type, including numbers, strings, and dates.

True False

DEFAULT values can be defined for various data types, including numeric, character, and date data types.

True / False

In Oracle, the DEFAULT constraint can be added to an existing column using the ALTER TABLE statement.

True False

The DEFAULT constraint can be added to an existing column using the ALTER TABLE statement with the MODIFY clause.

True / False

If a DEFAULT constraint is defined on a column, it will override any value provided during an insert operation.

True False

The DEFAULT constraint only provides a value if none is specified; it does not override values provided during an insert operation.

True / False

In Oracle, a column with a DEFAULT constraint can also have a NOT NULL constraint.

True False

A column can have both a DEFAULT and a NOT NULL constraint, ensuring that the column always has a value, either provided or defaulted.

True / False

In Oracle, the DEFAULT constraint can reference other columns in the same table.

True False

The DEFAULT constraint cannot reference other columns; it must be a constant expression.

True / False

When modifying an existing DEFAULT constraint in Oracle, the new default value will apply to all existing rows in the table.

True False

Modifying the DEFAULT constraint only affects new rows inserted after the change; existing rows are not updated with the new default value.

True / False

In Oracle, you can drop a DEFAULT constraint using the ALTER TABLE statement.

True False

The DEFAULT constraint can be dropped using the ALTER TABLE statement with the MODIFY clause to remove the default value.

Q10

True / False

The Oracle Certified Professional (OCP) exam includes knowledge on creating, managing, and modifying DEFAULT constraints in database tables.

True False

The OCP certification covers advanced topics, including the creation, management, and modification of DEFAULT constraints to ensure data integrity and consistency in Oracle databases.

Q11

Single Choice

What is the primary purpose of the DEFAULT constraint in Oracle?

To set a default database schema. To automatically assign a specified value to a column when no value is provided during an insert. To restrict the range of acceptable values in a column.To enforce referential integrity between tables.

The DEFAULT constraint in Oracle automatically assigns a specified value to a column if no value is provided during an insert operation.

Q12

Single Choice

In Oracle, which of the following SQL commands correctly defines a DEFAULT constraint for the SALARY column in the EMPLOYEES table, where the default value should be 5000?

CREATE TABLE EMPLOYEES ( ID NUMBER PRIMARY KEY, NAME VARCHAR2(100), SALARY NUMBER DEFAULT 5000 ); CREATE TABLE EMPLOYEES ( ID NUMBER PRIMARY KEY, NAME VARCHAR2(100), SALARY NUMBER CONSTRAINT default_salary DEFAULT 5000 ); CREATE TABLE EMPLOYEES ( ID NUMBER PRIMARY KEY, NAME VARCHAR2(100), SALARY NUMBER DEFAULT = 5000 );CREATE TABLE EMPLOYEES ( ID NUMBER PRIMARY KEY, NAME VARCHAR2(100), SALARY NUMBER WITH DEFAULT 5000 );

The correct syntax in Oracle to define a DEFAULT constraint for the SALARY column is to use SALARY NUMBER DEFAULT 5000.

Q13

Single Choice

Which of the following SQL statements will insert a row into the EMPLOYEES table with the DEFAULT value for the SALARY column in Oracle?

SQL Code

CREATE TABLE EMPLOYEES (
 ID NUMBER PRIMARY KEY,
 NAME VARCHAR2(100),
 SALARY NUMBER DEFAULT 3000
);

INSERT INTO EMPLOYEES (ID, NAME)
VALUES (1, 'John Doe');

The SALARY column will have the value 3000. The SALARY column will be NULL. The SALARY column will be 0.The SALARY column will cause an error due to missing value.

Since the DEFAULT value for SALARY is set to 3000, and no value is provided during the insert, Oracle will automatically use the DEFAULT value.

Q14

Single Choice

In Oracle, how can you modify an existing table to add a DEFAULT constraint to the HIRE_DATE column, setting the default value to the current date?

ALTER TABLE EMPLOYEES MODIFY HIRE_DATE DEFAULT SYSDATE; ALTER TABLE EMPLOYEES ADD CONSTRAINT default_hire_date DEFAULT SYSDATE; ALTER TABLE EMPLOYEES ADD DEFAULT SYSDATE FOR HIRE_DATE;ALTER TABLE EMPLOYEES MODIFY HIRE_DATE DEFAULT CURRENT_DATE;

The correct way to add a DEFAULT constraint in Oracle is using the MODIFY keyword with the DEFAULT value set to SYSDATE.

Q15

Single Choice

Given the following Oracle SQL code, what value will be inserted into the BONUS column if no value is provided?

SQL Code

CREATE TABLE EMPLOYEES (
 ID NUMBER PRIMARY KEY,
 NAME VARCHAR2(100),
 BONUS NUMBER DEFAULT 1000
);

INSERT INTO EMPLOYEES (ID, NAME)
VALUES (2, 'Jane Smith');

The BONUS column will be NULL. The BONUS column will be 0. The BONUS column will be 1000.An error will occur due to missing value.

The DEFAULT constraint for BONUS is set to 1000, so if no value is provided, Oracle will automatically use the DEFAULT value.

Q16

Single Choice

How would you define a DEFAULT constraint on a STATUS column in the ORDERS table in Oracle, where the default value should be 'Pending'?

ALTER TABLE ORDERS ADD CONSTRAINT default_status DEFAULT 'Pending'; ALTER TABLE ORDERS MODIFY STATUS DEFAULT 'Pending'; ALTER TABLE ORDERS ADD DEFAULT 'Pending' TO STATUS;ALTER TABLE ORDERS MODIFY STATUS SET DEFAULT 'Pending';

The MODIFY keyword is used in Oracle to add a DEFAULT constraint to an existing column.

Q17

Single Choice

Consider the following Oracle SQL table creation. What will happen if an INSERT statement does not provide a value for the CREATED_AT column?

SQL Code

CREATE TABLE DOCUMENTS (
 DOC_ID NUMBER PRIMARY KEY,
 DOC_NAME VARCHAR2(100),
 CREATED_AT DATE DEFAULT SYSDATE
);

The CREATED_AT column will be NULL. The CREATED_AT column will contain SYSDATE. The INSERT statement will fail.The CREATED_AT column will contain a system-generated unique value.

The DEFAULT value for the CREATED_AT column is set to SYSDATE, so if no value is provided, Oracle will insert the current date and time.

Q18

Single Choice

In Oracle, which of the following statements correctly drops the DEFAULT constraint from the DISCOUNT column in the ORDERS table?

ALTER TABLE ORDERS MODIFY DISCOUNT DROP DEFAULT; ALTER TABLE ORDERS MODIFY DISCOUNT DEFAULT NULL; ALTER TABLE ORDERS MODIFY DISCOUNT REMOVE DEFAULT;ALTER TABLE ORDERS DROP DEFAULT DISCOUNT;

The correct syntax to drop a DEFAULT constraint in Oracle is to use MODIFY DISCOUNT DROP DEFAULT.

Q19

Single Choice

What will happen in Oracle if a DEFAULT constraint is defined on a NOT NULL column, and an insert statement does not provide a value for that column?

The DEFAULT value will be inserted. The column will be set to NULL. An error will be thrown.The column will be set to 0.

If a DEFAULT constraint is defined, and no value is provided, Oracle will insert the DEFAULT value, even if the column is NOT NULL.

Q20

Single Choice

In Oracle, which of the following is true when you define a DEFAULT constraint on a column?

It overrides any value explicitly provided during an insert. It only applies when a NULL value is inserted. It is ignored if a NOT NULL constraint is also defined.It applies only when no value is provided during an insert.

The DEFAULT constraint in Oracle only applies when no value is provided during an insert operation. It does not override explicit values provided by the user.

Q21

Multiple Choice

Identify the SQL scripts that correctly define a DEFAULT constraint on a numeric column in Oracle.

CREATE TABLE employees ( bonus NUMBER DEFAULT 1000 ); CREATE TABLE employees ( bonus NUMBER DEFAULT 0 ); CREATE TABLE employees ( bonus NUMBER DEFAULT 1000 NOT NULL );CREATE TABLE employees ( bonus NUMBER DEFAULT 100 );

The DEFAULT constraint is used to provide a default value for a column when no value is specified during an insert operation. The correct scripts will demonstrate how to define a DEFAULT constraint on the 'bonus' column.

Q22

Multiple Choice

Select the SQL scripts that correctly modify an existing column to add a DEFAULT constraint in Oracle.

ALTER TABLE employees MODIFY salary DEFAULT 5000; ALTER TABLE employees ADD DEFAULT 5000 FOR salary; ALTER TABLE employees MODIFY salary NUMBER DEFAULT 5000;ALTER TABLE employees MODIFY salary SET DEFAULT 5000;

Modifying an existing column to add a DEFAULT constraint involves using the ALTER TABLE statement. The correct scripts will demonstrate how to add a DEFAULT constraint to the 'salary' column.

Q23

Multiple Choice

Determine the SQL scripts that correctly query rows where a column has its DEFAULT value in Oracle.

SELECT * FROM orders WHERE status = 'Pending'; SELECT * FROM orders WHERE status IS DEFAULT; SELECT * FROM orders WHERE status = 'Pending' AND status IS NOT NULL;SELECT * FROM orders WHERE status = 'Pending' OR status IS NULL;

Querying rows where a column has its default value involves checking the specific value that the DEFAULT constraint is set to. The correct scripts will demonstrate how to query rows based on this condition.

Q24

Multiple Choice

Identify the SQL scripts that correctly insert data using a DEFAULT constraint in Oracle.

INSERT INTO customers (customer_id, name) VALUES (1, 'John Doe'); INSERT INTO customers (customer_id, name, membership_status) VALUES (1, 'John Doe', DEFAULT); INSERT INTO customers (customer_id, name, membership_status) VALUES (1, 'John Doe', 'Basic');INSERT INTO customers (customer_id, name, membership_status) VALUES (1, 'John Doe', NULL);

Inserting data into a column with a DEFAULT constraint allows you to omit that column from the insert statement, letting the default value be applied. The correct scripts will demonstrate these methods.

Q25

Multiple Choice

Select the SQL scripts that correctly enforce a DEFAULT constraint during table creation in Oracle.

CREATE TABLE products ( product_id NUMBER PRIMARY KEY, availability VARCHAR2(20) DEFAULT 'In Stock' ); CREATE TABLE products ( product_id NUMBER PRIMARY KEY, availability VARCHAR2(20) CONSTRAINT df_availability DEFAULT 'In Stock' ); CREATE TABLE products ( product_id NUMBER PRIMARY KEY, availability VARCHAR2(20) DEFAULT 'Out of Stock' );CREATE TABLE products ( product_id NUMBER PRIMARY KEY, availability VARCHAR2(20) NULL );

Enforcing a DEFAULT constraint during table creation involves specifying the default value directly in the column definition. The correct scripts will demonstrate this.

Q26

Multiple Choice

Identify the SQL scripts that correctly remove a DEFAULT constraint from an existing column in Oracle.

ALTER TABLE sales MODIFY discount DROP DEFAULT; ALTER TABLE sales ALTER COLUMN discount DROP DEFAULT; ALTER TABLE sales DROP DEFAULT FOR discount;ALTER TABLE sales MODIFY discount SET DEFAULT NULL;

Removing a DEFAULT constraint involves altering the column definition to remove the default value setting. The correct scripts will demonstrate how to remove the DEFAULT constraint.

Q27

Multiple Choice

Determine the SQL scripts that correctly define a table with multiple DEFAULT constraints in Oracle.

CREATE TABLE subscriptions ( subscription_id NUMBER PRIMARY KEY, subscription_type VARCHAR2(20) DEFAULT 'Basic', status VARCHAR2(20) DEFAULT 'Active' ); CREATE TABLE subscriptions ( subscription_id NUMBER PRIMARY KEY, subscription_type VARCHAR2(20) CONSTRAINT df_subscription_type DEFAULT 'Basic', status VARCHAR2(20) CONSTRAINT df_status DEFAULT 'Active' ); CREATE TABLE subscriptions ( subscription_id NUMBER PRIMARY KEY, subscription_type VARCHAR2(20) DEFAULT 'Premium', status VARCHAR2(20) DEFAULT 'Inactive' );CREATE TABLE subscriptions ( subscription_id NUMBER PRIMARY KEY, subscription_type VARCHAR2(20) NULL, status VARCHAR2(20) NULL );

Multiple DEFAULT constraints can be defined on different columns within a table. The correct scripts will demonstrate how to define these constraints for the 'subscription_type' and 'status' columns.

Q28

Multiple Choice

Select the SQL scripts that correctly validate data after adding a DEFAULT constraint in Oracle.

SELECT * FROM locations WHERE region IS NULL; SELECT * FROM locations WHERE region = 'Unknown'; SELECT * FROM locations WHERE region IS DEFAULT;SELECT * FROM locations WHERE region IS NOT NULL;

Validating data after adding a DEFAULT constraint may involve checking that all rows now have the default value applied where no value was previously provided. The correct scripts will demonstrate this.

Q29

Multiple Choice

Identify the SQL scripts that correctly use the DEFAULT constraint when inserting multiple rows in Oracle.

INSERT INTO products (product_id, product_name) VALUES (1, 'Product A'); INSERT INTO products (product_id, product_name, category) VALUES (2, 'Product B', DEFAULT); INSERT INTO products (product_id, product_name, category) VALUES (3, 'Product C', 'Specialty');INSERT INTO products (product_id, product_name, category) VALUES (4, 'Product D');

Inserting multiple rows while using the DEFAULT constraint involves omitting the 'category' column in some insert statements to allow the default value to be applied. The correct scripts will demonstrate this.

Q30

Multiple Choice

Determine the SQL scripts that correctly handle inserting NULL into a column with a DEFAULT constraint in Oracle.

INSERT INTO orders (order_id, order_date) VALUES (1, NULL); INSERT INTO orders (order_id) VALUES (2); INSERT INTO orders (order_id, order_date) VALUES (3, DEFAULT);INSERT INTO orders (order_id, order_date) VALUES (4, SYSDATE);

Inserting a NULL value into a column with a DEFAULT constraint may result in either the NULL being accepted or the DEFAULT value being applied, depending on the database settings. The correct scripts will demonstrate how to handle this scenario.

Oracle Database Quiz Questions