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mapping, Database Management System
external and internal mapping with examples
Posted Date: 3/19/2013 11:48:43 AM | Location : USA
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Answer, Describe multi key files
Describe multi key files
Write query to list the staff who work within the branch, Consider the foll...
Consider the following relations: BRANCH( bno, street, area, city, pcode, Tel_no, Fax_no) STAFF( Sno, Fname, Lname, address, position , salary, bno) Express the subsequent qu
List the reg-no of vehicles owned in relational algebra, Given the followin...
Given the following relations Vehicle (Reg_no, make, colour) Person(eno, name, address) Owner(eno, reg_no) Write expressions in the relational algebra to answer the following
Find names of employees, Consider the relations EMP(ENO,ENAME,AGE,BASIC_S...
Consider the relations EMP(ENO,ENAME,AGE,BASIC_SALARY) WORK_IN(ENO,DNO) DEPT(DNO,DNAME,CITY) Express the following queries in SQL (i) Find names of employees who work in a dep
Explain view in rdbms, Explain view in RDBMS? View - A view is a relati...
Explain view in RDBMS? View - A view is a relation (virtual rather than base) and could be used in query expressions, which is, queries can be written by using the view as a re
Objectives-file organisation in dbms, Objectives After reading this un...
Objectives After reading this unit you should be able to: Explain storage of databases on hard disks; Discuss the execution of various file Organisation techniques;
Mapping Constraints, what is Mapping Constraints? with examples
what is Mapping Constraints? with examples
Problems of concurrent transactions-lost updates, Lost Updates : Suppose th...
Lost Updates : Suppose the two transactions T3 and T4 run simultaneously and they happen to be interleaved in the following way (suppose the initial value of X as 10000):
What is a primary index, What is a primary index? A primary index is an...
What is a primary index? A primary index is an index whose search key also explains the sequential order of the file.
Command line interfaces, Command Line Interfaces: These are interactive int...
Command Line Interfaces: These are interactive interfaces, character-based that let you use the complete power and functionality of the DBMS query language directly. They permit yo
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