Which of the Following Best Describes the Primary Key

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All records in a primary key must be unique a primary key cannot contain NULL values a. The primary key is the minimal set of attributes which uniquely identifies any row of a table.

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DTo ensure that each row in the table is unique.

. Which of the following best describes the purpose of a primary key. Because the primary key is used for lookups and comparisons a short primary key means the database management system can process it more quickly than a long primary key. To create the relationship between two tables.

It is selected from a set of candidate keys. To uniquely identify each record in a file. A CHECK constraint defines restrictions on the values that can be entered in a column or combination of columns.

To provide business information but are not required to build a database. 5 A foreign key is an attribute that exists in relational databases in order to carry out the. A primary key is a special relational database table column or combination of columns designated to uniquely identify each table record.

An attribute that serves as the primary key of another relation. Which of the following best describes the purpose of a primary key. Revise computer science GCSE by testing your knowledge in our primary key quiz.

Matches values of foreign keys in other classes D. Referential Integrity Constraints 7. Mark for Review 1 Points They are just copies of data in no particular order.

ATo support business processes across the organization. A primary key is an attribute that is required to exist in each table of a relational database and serves as the unique identifier for each record in a table. A foreign key is which of the following.

Group of answer choices. CTo create the relationship between two tables. Which of the following best describes the function of a primary key.

Gantt and PERT are types of _____ used to plan and schedule time relationships among project activities. Foreign Key Constraints are also known as. Mark for Review 1 Points ANY ALL IN Correct Correct 2.

To support business processes across the organization. A table can contain one or more columns suitable to be a primary key and that column or columns are called a candidate key. The definition of a primary key.

Use a number for the primary key whenever possible. A primary key column cannot have NULL values. Group of answer choices.

Which of the following best describes the function of the NEXTVAL virtual column. A foreign key is a field or collection of fields in one table that uniquely identifies a row of another table. A table can have only one primary key which may consist of single or multiple fields.

Oracle automatically generates unique values for columns that are defined as primary keys. Choose three Mark for Review. 11Which of the following best describes the purpose of a primary key.

Ensure primary key values will be unique even though gaps may exist Incorrect Incorrect. Specify a UNIQUE constraint on the CUSTOMER_ID column. A PRIMARY KEY constraint must be defined for each column in the composite primary key.

4 A primary key is an attribute that is required to exist in each table of a relational database and serves as the unique identifier for each record in a table. Which of the following best describes the purpose of a primary key Uniquely identifies each instance of the class 6 Which of the following statements about foreign keys is not true A foreign key cannot be NULL 7. The same thing as a primary key.

Generate a range of numbers and optionally cycle through them again Set a fixed interval between successively generated numbers. For example a table called Employee has a. To ensure that each row in the table is unique.

It depends upon the requirements and is done by the Database Administrator DBA. Which best describes a single-row subquery. Ensure primary key values will be unique even though gaps may exist 2.

SQL Server or other database management systems process number data types faster than character data types. Which comparison operator can only be used with a single-row subquery. A primary key uniquely defines each instance of a class in a.

Allows linking two or more tables B. Section 16 Quiz Database Programming With SQL. Only one candidate key can be selected as a primary key.

What Does Primary Key Mean. Indicates the minimum multiplicities for an association C. A Describes the characteristics of the class B Allows two tables to be connected C Matches values of foreign keys in other classes D Uniquely identifies each instance of the class Feedback.

Uniquely identifies each instance of the class. It cannot have a duplicate. A table cannot have more than one primary key.

Which of the following best describes the function of a CHECK constraint. BTo provide business information but are not required to build a database. A primary keys main features are.

4-Which of the following best describes the function of a CHECK constraint. Mark for Review 1 Points A query that returns only one row from the inner SELECT statement A query that returns one or more. A primary key is a field in a table which uniquely identifies each rowrecord in a database table.

In simpler words the foreign key is defined in a second table but it refers to the primary key in the first table. A primary key is used as a unique identifier to quickly parse data within the table. All of the above 8.

A foreign key is an attribute that exists in relational databases in order to carry out the relationship between two tables. Which of the following best describes the principle of least privilege. Sequences can be used to.

When multiple fields are used as a primary key they are called a composite key. Refer to Section 16 Lesson 1. There are a couple of rules to follow when choosing a primary key for a table.

Which of the following pieces of code will successfully create a foreign key in the CDS table that references the SONGS table. Primary keys must contain unique values. 3 CORRECT Which of the following best describes the purpose of a primary key.

Which of the following statements best describes indexes and their use. Post the primary key of Pet Owners as a foreign key in the Pets 17. The primary key cannot have a NULL value.

Mark for Review 1 Points. Any candidate key can become a primary key.

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