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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.
What is storage manager? A storage manager is a program module that gives the interface between the Low level data kept in a database and the application programs
Meaningful use refers to the use of certified EHR technology to "enhance quality, efficiency, and reduce health disparities
Explain Candidate key? Candidate Key - A candidate key is a minimal superkey, that can be used to uniquely identify a tuple in the relation.
Describe Hashing in DBMS? Hashing: Hashing is a technique to store data within an array so which storing, searching, inserting and deleting data is fast (in theory it's O(1))
PRINCIPLES OF DATABASE 1. State the following terms: a) Database b) Database Management System c) Entity d) Attribute e) Relationship 2. Discuss the Three Level Architecture
What are the General Transformation Rules for Relational operations? Ans: The transformation rules transform one relational algebra expression to AN EQUIVALENT ONE 1. E
database help
Consider the entity type dependent related to employee entity, which is used to keep track of the dependents of every employee. The attributes of dependents are: name, sex, birth d
Types of Data fragmentation
deffine class&object
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