10 Questions
¿Quién propuso el modelo relacional de bases de datos?
Edgar Frank Codd
¿Qué lenguaje se utiliza para manipular información en bases de datos relacionales?
SQL
¿Qué son las restricciones en una base de datos relacional?
Limitaciones utilizadas para limitar los datos que pueden ser almacenados en las tablas.
¿Qué son las relaciones base en una base de datos relacional?
Relaciones que almacenan datos en una tabla
¿Qué son las relaciones derivadas en una base de datos relacional?
Relaciones que se calculan mediante operaciones relacionales.
¿Qué son los dominios en una base de datos relacional?
Conjuntos de valores posibles para un atributo específico en una tabla
¿Qué es una clave primaria en una base de datos relacional?
Identificador único para cada registro en una tabla
¿Qué son las claves foráneas en una base de datos relacional?
Claves que hacen referencia a una clave en otra tabla
¿Qué es la normalización de datos en una base de datos relacional?
Proceso de eliminación de redundancia de datos para mejorar la eficiencia
¿Qué son las vistas en una base de datos relacional?
Relaciones derivadas implementadas como una consulta
Study Notes
- Relational databases (BDR) are a type of database that follows the relational model.
- The relational model was proposed by Edgar Frank Codd in 1970 and quickly became a new paradigm in database models.
- A relational database management system (RDBMS) is used to maintain relational databases and SQL is used to query and maintain them.
- In a BDR, all data is stored and accessed through pre-established relationships.
- Relationships that store data are called base relationships and their implementation is called a "table".
- Other relationships do not store data but are calculated by applying relational operations and are called derived relationships, implemented as a "view" or "query".
- Constraints are used to limit the data that can be stored in tables and can be defined by the user or inherently defined by the relational database.
- Domains describe a set of possible values for a specific attribute in a table.
- Primary keys uniquely identify each record in a table, while foreign keys reference a key in another table and index keys allow for faster access to data.
- SQL is the most common language used to manipulate information in relational databases.
- Tables can contain different types of data such as text, numbers, dates, logical information, and images.
- The design of a table should focus on determining the necessary fields and defining them properly with a specific name, type, and length.
- Tables are used to organize and store data in a structured way.
- Fields are the columns in a table that represent a specific type of data.
- Records are the rows in a table that contain information related to a specific entity or item.
- Primary keys are a unique identifier for each record in a table.
- Relationships between tables can be established through foreign keys.
- Tables can be joined to combine data from multiple tables.
- The design of a table should consider data normalization to avoid redundancy and improve efficiency.
- Tables are commonly used in database management systems.
Test your knowledge on relational databases with this quiz! From understanding the basics of BDRs and RDBMSs to knowing how to create and manipulate tables, this quiz covers it all. You'll also learn about constraints, domains, and keys, as well as how to establish relationships between tables, join tables, and normalize data. Whether you're a beginner or an experienced user, this quiz will challenge and expand your understanding of relational databases.
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