Test Your Microsoft SQL Server DEFAULT Constraint Knowledge with This Quiz

Progress

True / False

DEFAULT constraints can be used to provide a default value for a column when no value is specified during an INSERT.

True False

DEFAULT constraints specify a default value that will be used when no value is provided.

True / False

A DEFAULT constraint can be used to automatically increment a numeric column.

True False

DEFAULT constraints cannot automatically increment a column; this requires an IDENTITY property.

True / False

DEFAULT constraints can be applied to columns of any data type.

True False

DEFAULT constraints can be applied to any data type except columns that have computed values.

True / False

A column with a DEFAULT constraint cannot also have a NOT NULL constraint.

True False

A column with a DEFAULT constraint can also have a NOT NULL constraint.

True / False

DEFAULT constraints are ignored if a value is explicitly provided during an INSERT operation.

True False

DEFAULT constraints are used only when no value is provided during an INSERT operation.

True / False

DEFAULT constraints can be used to assign default values to existing rows in a table.

True False

DEFAULT constraints are applied only to new rows; existing rows are not affected.

True / False

DEFAULT constraints can include expressions or functions to compute default values.

True False

DEFAULT constraints can use expressions or functions to determine default values.

True / False

A DEFAULT constraint can be removed from a column using the ALTER TABLE statement.

True False

DEFAULT constraints can be dropped using the ALTER TABLE statement.

True / False

DEFAULT constraints are applied only when the column value is NULL during an INSERT operation.

True False

DEFAULT constraints are applied when no value is provided, regardless of NULL or non-NULL values.

Q10

True / False

DEFAULT constraints cannot be used in combination with IDENTITY properties.

True False

DEFAULT constraints and IDENTITY properties can be used together, but serve different purposes.

Q11

True / False

The DEFAULT constraint can be used to specify a default value for a foreign key column.

True False

DEFAULT constraints can be used on foreign key columns just like other columns.

Q12

True / False

DEFAULT constraints are automatically enforced by the SQL Server database engine.

True False

DEFAULT constraints are enforced automatically when rows are inserted or updated.

Q13

True / False

The DEFAULT constraint can be used to enforce a value format, such as date or numeric format.

True False

DEFAULT constraints can set default values but do not enforce value formats.

Q14

True / False

DEFAULT constraints cannot be applied to columns that already have a default value specified.

True False

DEFAULT constraints can be added to columns even if they already have a default value.

Q15

True / False

DEFAULT constraints are useful for ensuring that a column always has a value, even if none is provided during an INSERT.

True False

DEFAULT constraints provide a default value when none is specified during an INSERT.

Q16

Single Choice

Which statement is used to add a DEFAULT constraint to an existing column?

ADD DEFAULT ALTER DEFAULT ALTER TABLEMODIFY DEFAULT

The ALTER TABLE statement is used to add DEFAULT constraints to existing columns.

Q17

Single Choice

What happens if you insert a NULL value into a column with a DEFAULT constraint?

The DEFAULT value is used. An error is raised. NULL is inserted.The operation fails.

The DEFAULT constraint will provide a default value if no value is provided during an INSERT.

Q18

Single Choice

Which SQL Server keyword is used to remove a DEFAULT constraint?

REMOVE DELETE DROPALTER

The DROP CONSTRAINT statement is used to remove a DEFAULT constraint.

Q19

Single Choice

What is the primary purpose of using a DEFAULT constraint in SQL Server?

To enforce a specific data type. To provide a default value when no value is specified. To ensure uniqueness.To enforce referential integrity.

DEFAULT constraints provide a default value for a column when none is specified.

Q20

Single Choice

Can DEFAULT constraints be used in conjunction with other constraints like PRIMARY KEY?

Yes No Only with UNIQUE constraintsOnly with NOT NULL constraints

DEFAULT constraints can be used alongside other constraints such as PRIMARY KEY.

Q21

Single Choice

Which of the following cannot be used as a default value in a DEFAULT constraint?

CURRENT_TIMESTAMP 0 NULLAVG()

DEFAULT constraints cannot use aggregate functions.

Q22

Single Choice

In SQL Server, which statement is correct regarding the application of DEFAULT constraints?

They are applied during both INSERT and UPDATE operations. They are applied during INSERT operations only. They are applied during DELETE operations.They are not automatically applied.

DEFAULT constraints are applied during INSERT operations when no value is provided.

Q23

Single Choice

What type of constraint is used to provide a default value for a column when no value is specified?

DEFAULT CHECK PRIMARY KEYFOREIGN KEY

A DEFAULT constraint provides a default value for a column when no value is specified.

Q24

Single Choice

When adding a DEFAULT constraint to a column, which keyword is used in SQL Server?

SET DEFAULT ADD DEFAULT CREATE DEFAULTDEFAULT

The DEFAULT keyword is used to define default values for columns.

Q25

Single Choice

Which of the following is a valid default value for a DATE column using a DEFAULT constraint?

SYSDATE GETDATE() CURRENT_TIMESTAMPNOW()

CURRENT_TIMESTAMP is a valid default value for a DATE column.

Q26

Single Choice

Which SQL statement is used to modify an existing DEFAULT constraint?

MODIFY DEFAULT ALTER DEFAULT UPDATE DEFAULTALTER TABLE

The ALTER TABLE statement is used to modify constraints, including DEFAULT constraints.

Q27

Single Choice

What is the effect of defining a DEFAULT constraint on a column with existing data?

All existing data is updated with the default value. Only new rows will use the default value. An error is raised.Existing rows are updated to NULL.

The DEFAULT constraint affects only new rows; existing data is not modified.

Q28

Single Choice

In SQL Server, which keyword is used to define a default value for a column?

DEFAULT CHECK CONSTRAINTUNIQUE

The DEFAULT keyword is used to define a default value for a column.

Q29

Single Choice

Can a DEFAULT constraint be applied to a column that is part of a PRIMARY KEY?

Yes No Only if it is the first columnOnly if it is the last column

A DEFAULT constraint can be applied to any column, including those in a PRIMARY KEY.

Q30

Single Choice

Which of the following functions can be used as a default value in a DEFAULT constraint?

SUM() AVG() GETDATE()COUNT()

The GETDATE() function can be used as a default value in a DEFAULT constraint.

Q31

Multiple Choice

Which of the following are valid default values for a VARCHAR column?

NULL '' 'default'0

NULL, empty string, and any string value are valid default values for a VARCHAR column.

Q32

Multiple Choice

What are the benefits of using DEFAULT constraints in SQL Server?

Ensure data consistency Reduce data entry errors Improve query performanceAutomate data validation

DEFAULT constraints ensure data consistency and reduce the need for manual data entry.

Q33

Multiple Choice

Which of the following statements about DEFAULT constraints are true?

They provide a default value when no value is specified. They can enforce data types. They apply only to new rows.They are automatically applied by the database engine.

DEFAULT constraints provide default values when no value is provided, but cannot enforce data types.

Q34

Multiple Choice

Which functions can be used as default values in a DEFAULT constraint?

CURRENT_TIMESTAMP GETDATE() SUM()CONSTANT

CURRENT_TIMESTAMP, GETDATE(), and constant expressions can be used as default values in a DEFAULT constraint.

Q35

Multiple Choice

Which constraints can be used together with DEFAULT constraints?

PRIMARY KEY FOREIGN KEY CHECKUNIQUE

DEFAULT constraints can be used with PRIMARY KEY, FOREIGN KEY, and UNIQUE constraints.

Q36

Multiple Choice

Which of the following are true about removing a DEFAULT constraint?

Use ALTER TABLE statement Existing data is updated Future inserts may be affectedCannot be removed once applied

Removing a DEFAULT constraint involves using the ALTER TABLE statement and may affect future inserts.

Q37

Multiple Choice

In which scenarios are DEFAULT constraints particularly useful?

Ensuring non-null values Setting default states Enforcing unique valuesReducing manual data entry

DEFAULT constraints are useful in ensuring non-null values, setting default states, and reducing manual entry.

Q38

Multiple Choice

What happens when a default value is defined for a column?

It is used when no value is provided. It overrides provided values. It helps maintain data consistency.It prevents NULL values.

When a default value is defined, it is used when no value is provided, helping maintain data consistency.

Q39

Multiple Choice

Which of the following are limitations of DEFAULT constraints?

Cannot enforce complex data validation Cannot ensure uniqueness Cannot provide default valuesCannot be combined with other constraints

DEFAULT constraints cannot be used to enforce complex data validation or ensure uniqueness.

Q40

Multiple Choice

Which of the following statements are true about the DEFAULT keyword?

Used to define default values Can be combined with other constraints Only applies to numeric columnsOverrides explicit values

The DEFAULT keyword is used to define default values for columns and can be combined with other constraints.

Q41

Multiple Choice

Which of the following are valid data types for DEFAULT constraints?

VARCHAR INT DATEBLOB

DEFAULT constraints can be applied to columns of various data types, including numeric, string, and date types.

Q42

Multiple Choice

Which of the following can be used as default values for a DATE column?

CURRENT_TIMESTAMP GETDATE() '2022-01-01'SYSDATE

CURRENT_TIMESTAMP, GETDATE(), and constant dates can be used as default values for a DATE column.

Q43

Multiple Choice

Which functions are typically used as default values in DEFAULT constraints for timestamps?

CURRENT_TIMESTAMP GETDATE() SYSDATENOW()

CURRENT_TIMESTAMP and GETDATE() are typically used as default values for timestamps.

Q44

Multiple Choice

Which of the following are characteristics of DEFAULT constraints?

Provide default values Enforce uniqueness Apply only to new rowsCan be used with CHECK constraints

DEFAULT constraints provide default values, do not enforce uniqueness, and apply only to new rows.

Q45

Multiple Choice

Which of the following are true about the use of DEFAULT constraints in SQL Server?

Defined with the DEFAULT keyword Can be used with various data types Apply to new rowsCannot be altered once defined

DEFAULT constraints in SQL Server are defined with the DEFAULT keyword, can be used with various data types, and apply to new rows.

Microsoft SQL Server Database Quiz Questions