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Problem
1. Write the SQL queries using Data Manipulation Language (DML) statements.
>> Writing SQL using DML for each part:
2. Create the payroll database considering table employee.
1. Do simple queries on the above database.
i. list all information of the above both tables.
ii. list the empno, ename, jobtitle,and hiredate of employee from the employee table.
2. list the name, salary of the employees who are clerks. 3. list the name,job,salary of every employee joined on certain date. (say ‘december 17,1980') 4. list name and annual salary of all the employees. 5. list the employees who have salary between certain range (say between Rs. 1000 & 2000)
>> Creating database according to 5 subparts
Illustrate the statement 'Projection operation distributes over the union operation'. Give an example. Ans: Π L (E 1 ∪ E 2 ) = (Π L (E 1 )) ∪ (Π L (E 2 )) This says th
A distributed transaction consists of subtransactions that execute at different sites and access local DBMSs at those sites. For example, a distributed transaction that transfers m
Describe Parameteric end users? Parametric end users might be given update access, but are commonly not permitted to change the structure of data.
The Database Approach In order to overcome the limits of a file system, a new approach was needed. Hence a database approach emerged. A database is a persistent collection of
The data of a view is not physically stored, but derived from one or more tables. True the data of a view is not physically stored
Determine the OBJECTIVES of object design After passing through this unit, you should be able to: describe and apply concept of generalisation; understand and appl
what is specialization?
explain the mapping constraints
What is Primary key? Primary Key - Primary key is one of the candidate keys which uniquely identifies each row in the relation.
2NF Normal Form : A relation schema process R is in 2NF if it is in 1NF and each non-prime attribute A in R is fully functionally related on primary key. Second normal form (2N
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