When building a database, records should be added after fields have been created, a key field has been chosen, and the database has been given a name.
The process of compiling data and information into a database is largely done so that it may be quickly searched and retrieved by computers. The sub-schema outlines the reasoning behind the portion of the database that pertains to and is accessible by a certain application. This type of database is shared by two or more programs. While the instance is a type of database that records all kinds of data and information rapidly and quickly. As a result, the database sub-schema is the logical architecture of the database, whereas the database instance is a snapshot of the data in the database at a particular point in time.
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