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Relational database management systems (RDBMS) store data in tables and use SQL for access and modification. They can be used for inventory, employee, customer data, and more. RDBMSs use primary, unique, and foreign keys for data recovery and can have different types of tables. Indexes can speed up data recovery.
A relational database management system (RDBMS) is a specific type of database that contains tables of data. These types of databases are often used to support one or more affiliated software applications. A database-specific programming language is used to modify and report data. Several techniques can speed up data recovery and reduce duplication.
Organizations can use RDBMSs to store inventory, employee, customer and other data. Users can interact with the system through software applications that include programming code for working with the database. These software applications can be traditional or web-based.
A relational database management system consists of tables with columns and rows. The column label identifies the data in the rows within the column. Each row contains the actual data for one instance of an entity, which can be a person, place, object, or idea. For example, a customer database might have columns for customer ID, first and last name, and email address, and each row contains data for a single customer.
These systems are accessed and updated using a structured query language (SQL). To work with data, a database developer will write programming statements called queries. Different database management system brands may require the use of different versions of SQL, although they have many similarities.
An RDBMS can use different types of tables. Base tables contain the entire data set. Temporary tables store data that is manipulated during the execution of a query. Result tables store query results.
Relational database management systems use different types of keys for data recovery. A primary key identifies a particular instance of an entity. For an employee table, the primary key can be an employee identification number that every employee is permanently assigned to and that no other employee will use. Unique keys are other data items unique to each instance of an entity. For example, a retailer can assign inventory items with unique vendor item numbers.
A third type of key is a foreign key. In the relational model, it establishes relationships between entities. Using foreign keys, a relationship between a company’s customers and each customer’s sales can be maintained without duplicating data in the relational database management system.
Speed of data recovery is important, especially as the amount of data increases. A developer can add an index to an RDBMS to enable faster execution of queries. The index typically uses a primary key, such as a tax identification number.
