Database Record For Music From An App

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

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

A Table is where you are organised and store data so you have to create the table before store any data. By creating table, you need to define few things, Fields name, Data type, and the Description.

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

Primary Keys: Primary keys are items that are used to find a record of something on the system with certainty. These files cannot be duplicated and will normally provide a primary key e.g. “autoconters”.

One of the main components of a database is characters. Characters are letters, numbers and punctuation marks. You are using characters when you are typing a sentence for example. Another main component would be fields. Fields separate data in defined fields. When data is being entered even if you don’t have an answer for all fields a space is still left but it would be blank. If you have ever seen an excel spreadsheet that would give you an idea of how data is lined out into different fields. Records are a main database component as well. Records are a group of fields that are about one thing. An example would be social security numbers in a database of patients. Each patient would have a social security number and each social security number is in a field. That field would have the same information which is that patients social security number even though every ones is different and there would be many listed depending on how many patients was in the database. Gartee, R. (2011).

The electronic database is a collection of information that is organised so this can be easily accessed, managed and updated. It is a collection of reports, tables, queries and reviews. This can be in the form of titles or subject for instance personal or involvements. Category or reference number and you can store a wide range of information by collating information alphabetically, numerical and chronological.

Required: If the key is defined within a table, it will never have a null value. Information cant referenced without a Primary key. Value is required by the software.

Data is information that is stored and organized by fields and records. A field which can also be known as an attribute is a single unit of information, like a surname of an IBM employee. A record or tuple is a collection of related fields. For example, an employee record contains all information fields that are relevant to a specific IBM employee. Additionally, a file (also known as a table) has multiple records that are pertaining to a specific topic. “To signify, an employee file of a hotel contains all employee records (Rob, 2010). Lastly, a database comprises all related files. A hotel database, among others, consists of employee files, room files, customer files, and payment files.”

In a database, a complete set of attributes for a single occurrence of an entity class is called

Databases allow us to easily store and retrieve data in a purely digital format. The strength of this is that large amounts of data can be stored and retrieved with minimal effort on the part of the user. Opposed to manually flipping through files, one can quickly pull up the requested data through a computer program. Many systems that were conventionally paper and file based have been converted to a digital format which are now stored in one or more databases.

The relational model organizes data into multiple tables and assigns a value to attributes in each row and column, with a unique key for each row. Other tables can use these keys to access the data without reorganizing the table.

In a RDBMS, the tables will have an identifier called primary key. Data values will be stored in the form of tables. The relationships between these data values will be stored in the form of a table as well. Every value stored in the relational database is accessible. This value can be updated by the system. The data in this system is also physically and logically

DBMS provides a catalog that contains information about the data and catalogs that can be accessed by users.