A system intended for simply organizing, storing, and retrieving large amounts of data is called a database. A database may include various levels of abstraction in its architecture. The external level defines how users view the data, and a single database may have multiple views. The internal level determines how information is stored, and there are different types of databases. These include analytical, data warehouses, and distributed databases.
Databases consist of tables, and they include rows and columns, much like spreadsheets in Excel. Each column corresponds with an element, while each row represents a single record. The Schema defines the composition and the organization of data. It explains how the information is given Schema demonstrates the construction of the tables, columns, names, and types.
The three kinds of Schema, which includes conceptual Schema, logical Schema, and physical Schema. Conceptual describes how concepts and relationships are exemplified. Logical categorizes show entities, attributes, and relations are mapped, and physical is a specific application of the logical Schema.