A schema is structure for a database.
The term is often used to refer either a text oriented description or a
graphical depiction of the database structure. The term is being used both in
Relational Database Management System (RDBMS) & Object (Oriented)
Database Management System (ODBMS). Both in RDBMS & ODBMS the Schema
define the tables, the fields in each table, and the relationship between
fields & tables.
ODBMS is being used in real time
systems & to power websites.
The Star & Snowflake are the
example of two common types of Schema.
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