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A database schema is a visual and logical architecture of a database created on a database management system.
It provides a graphical view of the entire database architecture and structure. It provides a means for logically grouping and displaying database objects such as tables, fields, functions and relations.
A database schema typically shows the different tables, their fields and the relationship between them and other tables. The database schema is defined within the native database language; therefore the logical structure and visualization of schema might vary in each database language. It helps database administrators in understanding the architectural layout of the database.
In addition to tables and fields, a database schema defines a database's: