SQL can be used to retrieve data, execute queries and edit data by deleting, updating or creating new records. Relational databases are also known as SQL databases, which is the language in which relational databases are written. Relationships between field types and tables are known as schema. When a table’s primary key is used in a different table, the column in the second table is called a ‘foreign key’. This column can also be used in other tables. Tables use columns to help define the information being stored and rows that hold the actual data.Įvery table contains a column that has unique values and acts as the ‘primary key’. These tables typically have shared information between them that creates a relationship between tables. Relational Databases And What They EntailĪ relational database, also known as a relational database management system (RDMS), stores data in tables.
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