Programming

Which of the following defines a relationship in which each occurrence of data in one entity

* As explained throughout this course, entity relationship modeling is a critical element of database design. If the database is not properly modeled, it is unlikely that the database will be properly developed. Using this knowledge, explain the key reasons why entity relationship modeling is important, and determine at least (1) way in which it impacts the overall development of the database.

A relational database is a database that consists of a collection of tables with columns showing entities, and rows showing data. This type of database uses a primary key and foreign key. The foreign key in another table will point to the primary key of a table, and this is how tables can relate to each other. This permits for one-to-one, one-to-many, and many-to-many relationship between the data. An advantage of relational databases includes the ease of adding or modifying new tables and entities without needing to change the structure of the database already in place. Relational database have many features, including indexing, setting data type, and setting validation tests, all these help to ensure data integrity.

Tuple is Unique: The tuples or rows in tables are unique within the table. This is enforce by primary key and other unique keys on columns which makes row unique.

If we consider an example of a database for billing the claims to the provider, we have two tables in the database as ‘Claims’ and ‘Provider’. ‘Claims’ have the claim information such as (ClaimNumber, ClaimType, Type of service, Admission details) and ‘Provider’ have the provider information such as (ProviderID, FederalTaxID, NPI, PointOfService). The primary keys for ‘Claims’ is “ClaimNumber” and for ‘Provider’ is “ProviderID”.

(TCO 7) What is the name for a unique key that is constructed from multiple columns?

1NF (First Normal Form): The relation has no repeating groups; all attributes are dependent on the primary key. [12]

The purpose of a primary key, and the appropriate selection and assignment of a field as primary key.

Prior to designing my database, I will have a clear understanding of the data. This will allow me to determine the purpose of the database. Once all information is

3) The SQL keyword PRIMARY KEY is used to designate the column(s) that are the primary key for the table.

The example discussed above on Customers table and Orders table is a one-to-many relationship. As each customer places multiple orders, each order only belongs to one customer. When creating a relationship between two tables, if only one of the related fields is unique, a one-to-many relationship is automatically set.

Memo is used to store text which is more than 255 characters in length and in it formatted text.

CA1-1 (FASB and Standard-Setting) Presented below are four statements which you are to identify as true or false. If false, explain why the statement is false.

Another difficulty using relations that have redundant information is the problem of update anomalies. These can be classified as Insertion, Deletion or Modification anamolies.

To enforce referential integrity for this relationship, select the Enforce Referential Integrity check box. Click Create. Access draws a relationship line between the two tables. If you selected the Enforce Referential Integrity check box, the line appears