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What is a primary key?
Primary key is chosen by the database designer as the principal means of identifying an entity in the entity set.
Information about a bank is about customers and their account. Customer has a name, address that consists of house number, area and city, and one or more phone numbers. Account ha
What is Foreign Key Foreign Key: Sometimes we may have to work with an attribute that does not have a primary key of its own. To recognize its rows, we have to use the primar
#question.what is mapping constraints and types?.
coventions for displaying an ER schema as ER diagram
What is Nested Queries explain in details? Nested Queries - A SELECT query could have subquery(s) in it. While a SELECT query having another SELECT query in it, is known as n
Differentiate between static hashing and dynamic hashing. Ans: Static Hashing comprises the number of primary pages in the directory fixed. So, while a bucket is full, we requ
When It is better to use files than a DBMS? It is better to use files than a DBMS when Multiple users wish to access the data.
1. Which model is used to store data in tree structures Ans: Hierarchical model is used to store data in tree structures
Distributed Control and Data sharing: The geographical distribution of an organization can be showed in the distribution of the data; if a number of different sites are linked to e
Type of views : Simple views and Difficult Views Feature Simple Views Complex Views Number of tables One
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