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Explain trigger?
Trigger: A database trigger is procedural code which is automatically executed within response to certain events on a particular table in a database. Triggers could restrict access to exact data, perform logging, or audit data modifications.
what is multivalued dependency
recovey techniques based on deferred update and immediate update
Can a domain, assigned to a data element be changed? Yes. We can do so by just overwriting the entry in the field domain.
Write short notes on data ware housing? Data ware housing applications needs the transformation of data from many sources into a cohesive reliable step set of data configured a
What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.
Explain the Deferred Update The deferred update methods do not physically update the database on disk till after a transaction reaches its commit point; after that the updates
What's the difference between a primary key and a unique key? Both primary key and unique key enforces uniqueness of the column on which they are explained. But by default prim
Design Of Distributed Databases: The distributed databases are mainly relational at local level. So a local database schema is the similar as that of a centralised database design
A Structure of a dependency diagram
How to draw an ER diagram to a finance companz
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