Description: Database Management Systems, DBMSs, are used to control, maintain, and use a relational database where the data is stored. A relational database consists of the data records, files, and database objects. An important part of each organization is allowing users to gain access to the data for them to view and manipulated if required. In order for users to do this query languages are used which enable users to write queries and send them to the database to retrieve the appropriate data and return it to them. Queries can also be written to manipulate the data by updating, deleting or inserting it to the database. The Structured Query Language, known as SQL or SEQUEL, is the main query language used by most DBMSs, this is based on relational algebra and relational calculus which was developed by Dr. Edgar Codd for his theory for the relational database. This course discusses the relational algebra operations and relational calculus for a relational database, how to use SQL to manage data in a relational database, and how transactions and concurrency control are used to ensure data integrity and data consistency. It also discusses how security is implemented in a relational database to keep the data secure.
Target Audience: People who want to get a thorough understanding of the fundamentals of databases.
Duration: 03:34
Description: A database is used by organizations to store their data, and allow their employees to access, update, and manage it. Organizations use a Database Management System, also known as a DBMS to control, store, organization and retrieve that data for the users through end-user applications. There are multiple types of database, such as flat-file, network, and hierarchical. The most widely used database is the relational database, which is based on a mathematical theory. This course discusses what database and DBMSs are, the different database models and the database architectures. It also discusses what relational databases are, its components, and how relational databases were identified by Dr. Edgar Codd, including the 12 rules that were identified that a database should adhere to be considered relational.
Target Audience: People who want to get a thorough understanding of the fundamentals of databases.
Duration: 03:14