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Let us now make the E-R diagram for the student database as per the explanation given in the previous section.
We can also states the overall logical structure of a database using ER model graphically with the help of an E-R diagram.
ER diagrams are composed of:
Figure: ER diagram of COLLEGE database
What is D command work in the respect of QBE? D: It is the command inside QBE to delete tuple(s) from the relation.
what are the main characteristics of database
What are the two types of indices? The two types of indices are:- A) Dense index B) Sparse index
What are the advantages and disadvantages of merging an association into a class? Advantages: i) Less number of tables ii) Faster performance due to the fewer tables
Make SQL statements for the following scenarios. Your response should contain SQL statement, output and any other assumptions you have made to arrive at the answer. For Colorado cu
Write short notes on Schema diagram. A database schema along with primary key and foreign key dependencies can be depicted pictorially by schema diagram. Every relation appea
The indices are accumulated in the index files. The data is accumulated in the data files. Indices give fast access to data items. For example, a book database may be managed in th
limitations and benefits in database tecknowlagy
Write a Query that uses the UNION Operator 1. Use the Software Experts database to: a. Display the first and the last name of all consultants who worked on any projects f
I am going to develop a web site to present decision tree structure. For this, I want a web application with AJAX technology to connect the database and prepare the decision tree's
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