What is a Database?
A database is an organized collection of structured information, or data, typically stored electronically in a computer system. A database is usually controlled by a database management system (DBMS). Together, the data and the DBMS, along with the applications that are associated with them, are referred to as a database system, often shortened to just a database. Most databases use structured query language (SQL) for writing and querying data.
What is SQL?
SQL is a programming language used by nearly all relational databases to query, manipulate, and define data, and to provide access control. SQL was first developed at IBM in the 1970s with Oracle as a major contributor, which led to the implementation of the SQL ANSI standard,
What are CRUD operations?
CRUD is an acronym that comes from the world of computer programming and refers to the four functions that are considered necessary to implement a persistent storage application: create, read, update and delete.
What is an E/R Diagram?
An Entity-Relationship (ER) Diagram is a type of flowchart that illustrates how “entities” such as people, objects, or concepts relate to each other within a system. ER Diagrams are most often used to design or debug relational databases in the fields of software engineering, business information systems, education, and research. Also known as ERDs or ER Models
What is Normalization?
Normalization is a database design technique that reduces data redundancy and eliminates undesirable characteristics like Insertion, Update, and Deletion Anomalies. Normalization rules divide larger tables into smaller tables and link them using relationships.
The inventor of the relational model Edgar Codd proposed the theory of normalization of data with the introduction of the First Normal Form, and he continued to extend theory with the Second and Third Normal Form.
Database assignment to work on
Learning outcomes
concept of normalization
E/R Diagram
Database implementation
CRUD operations
Database implementation
You are to model and then implement a MySQL database
1. Decide on a degree of normalization for your database.
2. Create an ER model of your database (using a well-known notation)
Database operations
Write a set of CRUD SQL statements for your database. one should be able to do the following:
Create the database.
Populate the database with a reasonable amount of data.
Perform several interesting queries on the data.
Change some data, possibly the database itself.
Through new queries, see the result of the changes.
Wipe some data from the database.
Delete the database
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