Normalization Is A Process Of A Composite Primary Key For All Tables

Identify the different types of entities, attributes, keys and relationships you will want to consider when designing the database.

* Write clearly and concisely about relational database management systems using proper writing mechanics and technical style conventions.

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.

To answer each question, darken the circle corresponding to your answer using a pencil. If you decide to change your answer, please erase your original answer completely and darken your new answer.

1.4 For the tables you created in Review Question 1.3, what are the primary keys of each table? Do you think that any of these primary keys could be surrogate keys?

2- Order Table - The Order Table is used to record information pertinent to each Order placed with a given store. Each order will have one or more entries in the Order Line Table associated with it.

This week was a little harder comparing to last; well it is expected because we are getting more into how to create a more dependable database. The topics for this week were “The problem of redundancy, Decompositions, Functional Dependencies and normal forms. We learned how to recognize and avoid the problem redundancy in database along with how to convert database schema into first, second, third normal forms.

There are three stages to normalization, 1st NF, 2nd NF, and 3rd NF. In the 1st NF stage must ensure that the table has no multivalued attributes. If there are the table should be broken down into separate tables so that there are no multivalued attributes. The 2nd NF stage requires that we break the tables down even more to ensure that all attributes and functional dependency entirely to the primary key and has met all requirements of the 1st NF. Then, and only then will it be considered to have met 2nd NF requirements. To transform the database to 3rd NF you must identify the primary key in the 2nd NF table. Then we must identify functional dependencies in the relationship to ensure there are no transitive dependencies. These types of dependencies can cause insertion, deletion, and update

My thoughts on normalization is that it requires multi-steps to enter the data into tabular format to ensure they are well-organized in a way that is consistent and lacks redundancy as well as prevent unintended or unambiguous results. As stated by Demba (2013) that normalization in relational database design often involves the process of organizing data and dividing the database into two or more tables with defined relationships in order to minimize

Normalization for entity-relationship modelling works as it does for other modelling systems, with some alterations. [13] The difference when using the entity-relationship data model is [14]:

When it comes to the data model, there exists a relationship that has three different representations for the reason that database requires the relationship between the tables. It goes hand-in-hand with one another without the relationship the tables would have no purpose. The information cannot be repetitive in order for the each table to work and provide the specific database that is related to the information. In different ways the tables in the Huffman Trucking Fleet Truck database

Draw an REA diagram with cardinalities and tables with primary keys, foreign keys, and non-key attributes for the following business:

We will assume that Number  Name where name is not unique (i.e., there may be more than one “John Smith”, each with a different student number). Then the functional dependencies are:

if A!B and B!C, then C is transitively dependent on A via B (provided that A is not functionally dependent on B or C) Third Normal Form (3NF) is a relation that is in first and second normal form in which no Non- Primary key attribute is transitively dependent on the primary key.

For this video rental store, the movie database contains three kinds of records namely customers, tapes, and rentals. Whenever a customer visits the video store, the database is looked at to determine whether the store attendants already know the new customer; and if not, a new record is added to update the new customer’s details (Beynon-Davies, 2004). In the database, important information about the customer that is stored includes the customer's name and each customer is given a unique identifier; usually an ID whenever their details have been entered into the database. In addition, in compiling the database, the customer's birth dates are vital in gauging whether they should be allowed to rent certain movies or not.