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What is an Operand?
The data on which the operation is to be performed is known as an Operand
Explain the two types of participation constraint. Total: The participation of an entity set E in a relationship set R is said to be total if each entity in E participates i
What does the extract statement do in extract datasets? The data is written to virtual memory by extract commands.
courier company er-diagram
explain concept of decomposition?
What are partial, alternate,, artificial, compound and natural key? Partial Key: It is a set of attributes that can uniquely recognize weak entities and that are related to s
Question: Consider the following database relations for a textbook ordering system used by a college bookshop: Book (b-copy#, bname, ISBN#, author, price, subject) Order (s#
What are called multilevel indices? Indices with two or more levels are known as multilevel indices.
, write the relational schema, and draw the new dependency diagrams. Identify the normal forms for each table structure you created
Define the terms 1) physical schema 2) logical schema. Physical schema: The physical schema explains the database design at the physical level, which is the lowest lev
Let us now talk about the relational operations: SELECT The select operation is used to select few specific record from the database based on different criteria, This is a un
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