Microsoft SQL Server Database Quiz Questions

A primary key constraint ensures that the column values are unique and non-null, providing a unique identifier for each row.

A table can have only one primary key, although that primary key can consist of multiple columns (composite key).

A primary key constraint does not allow NULL values in the column.

A composite primary key can consist of more than one column.

A primary key constraint can be added to an existing table using the ALTER TABLE statement.

Primary key values must be unique for each row in the table.

The primary key ensures that each row in the table is uniquely identified.

A foreign key is used to link two tables together, whereas a primary key uniquely identifies each row within a table.

A table can have both a primary key and a foreign key. The primary key uniquely identifies rows in the table, while the foreign key establishes a relationship with another table.

Even as part of a composite key, the primary key columns must collectively ensure unique values across the table.

Primary keys can be of any data type, not just numeric fields, as long as they uniquely identify each row.

A primary key inherently includes a unique constraint to ensure no duplicate values exist.

While technically possible, changing primary key values is not recommended as it can disrupt relationships and data integrity.

A primary key uniquely identifies each row and does not allow nulls, while a unique key ensures uniqueness but can allow nulls.

When a primary key is defined, SQL Server automatically creates a unique index on the primary key columns to enforce uniqueness.

A primary key uniquely identifies each record in a table and ensures that no duplicate or NULL values are entered in the primary key column(s).

A table can have only one primary key, but that primary key can consist of multiple columns (composite key).

A composite primary key is a primary key that consists of two or more columns that together uniquely identify a record in the table.

The primary key uniquely identifies each record in the table, ensuring that each row can be precisely located and accessed.

Defining a primary key automatically creates a unique index on the primary key columns to enforce uniqueness.

Primary keys can be of any data type as long as they uniquely identify each row. The choice depends on the specific requirements and design of the database.

While technically possible, modifying a primary key is not recommended as it can disrupt relationships and data integrity within the database.

A primary key must contain unique values and cannot contain NULLs. It ensures each record is unique and identifiable.

The primary key must have unique values and cannot contain NULLs, ensuring that each record in the table can be uniquely identified.

Setting a primary key column to NULL is not allowed because primary keys must have unique, non-null values to ensure each row is uniquely identifiable.

A foreign key can reference a composite primary key, establishing a relationship between the two tables based on the combination of columns in the composite key.

In SQL Server, a composite primary key can consist of up to 16 columns.

The ALTER TABLE statement is used to add a primary key to an existing table in SQL Server.

The PRIMARY KEY clause is used in the CREATE TABLE statement to define a primary key for the table.

SQL Server automatically creates a unique index to enforce a primary key constraint, ensuring that all values in the primary key column(s) are unique.

A primary key uniquely identifies each row in the table and ensures that no duplicate or NULL values exist in the primary key column(s).

Composite primary keys are used when a single column is not sufficient to uniquely identify each row in the table, often used in many-to-many relationships.

The primary key uniquely identifies each record in the table and ensures that no duplicate or NULL values exist in the primary key column(s).

Primary keys uniquely identify each row in the table, cannot contain NULL values, and enforce uniqueness through a unique index.

The PRIMARY KEY clause is used to enforce a primary key on multiple columns, ensuring the combination of values in these columns is unique.

A composite primary key enhances data integrity by ensuring that the combination of columns used as the primary key is unique for each row.

Primary keys ensure data integrity, provide unique identification for records, and improve query performance through indexing.

Primary keys must have unique values, cannot contain NULLs, and uniquely identify each row in the table. They cannot have duplicate values.

Primary keys uniquely identify each row in a table, while foreign keys create relationships between tables, referencing primary key columns.

Any columns can be part of a composite primary key as long as the combination of values in these columns uniquely identifies each row in the table.

The PRIMARY KEY clause is used in the CREATE TABLE statement to enforce a primary key constraint on a column, ensuring its values are unique and not NULL.

Composite primary keys are useful when a single column is not sufficient to uniquely identify each row, commonly used in junction tables for many-to-many relationships.

A composite primary key consists of multiple columns that together uniquely identify each row in the table, ensuring that the combination of values is unique.

Defining a primary key ensures each row is uniquely identifiable, helps maintain data integrity, and improves query performance through indexing.

Primary keys in SQL Server ensure uniqueness and non-null values, providing a unique identifier for each row and enforcing data integrity.