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What is a view in SQL? When can views be updated?
A view is a virtual table which consists of columns from one or more tables. Through it is same to a table; it is stored in the database. It is a query stored as an object. Therefore, a view is an object in that derives its data from one or more tables. These tables are referred to as base or underlying tables.
Views can be updated if they are described on a single table without any aggregate functions could be mapped to an update on the underlying base table under certain conditions.
Write short notes on relational model The relational model uses a collection of tables to show both data and the relationships between those data. The relational mo
Explain the conventions (relationships) for displaying an ER schema as an ER diagram.
The users who use easy-to-use menu are called ? The users who use easy to use menu are called as Naïve users.
WHAT IS DATABASE TECHNOLOGIES
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