Prove that the decomposition of r into r1 and r2 is lossless

Assignment Help Database Management System
Reference no: EM13509339

1.Prove that an MVD X →→ Y over a relation R can be expressed as the join dependency ;: {XY, X(R Y )}.

2.Let R be a relation schema with a set F of FDs. Prove that the decomposition of R into R1 and R2 is lossless-join if and only if F+ contains R1 ∩ R2 → R1 or R1 ∩ R2 → R2.

Reference no: EM13509339

Advantages and inconveniences of new relational scheme

Compare activity (quite theoretical) of the disk (in number of bytes) required for each of both relational. Write down the advantages and inconveniences of new relational sche

Create a brief presentation show and tell

Also create a brief presentation (show and tell) using the Chrome browser Media Core add in. Using Mediacore (a Chrome add in), put together and show a demonstration of your

Identify data security measures that you believe necessary

Suppose you are also in charge of securing your organization's data. Identify at least two data security measures that you believe are necessary to prevent data security iss

Describe database backup and disaster

Describe Database Backup - 2 pages, (b) Describe Disaster Planning - 2 pages, (c) Highlight the importance of the integration of both backups and disaster planning and the i

1nf figure converted to 2nf figure

1NF figure converted to 2NF figure with a explanation of the steps taken. Once in 2NF, it needs to be converted to 3NF, and explanation of steps taken is needed as well.

Examine the use of databases in organization

Create a 2-3 page (350 words per page) examining the use of databases in organization. Explain what database applications are utilized (Microsoft Access, DB2, Oracle, etc.).

Describe implement relationship between employees-projects

Describe how you would implement relationship between employees and projects in each of the given scenarios: Many employees can work on given project, but each employee can wo

Write an anonymous block that places a substitution variable

Write an anonymous block that places a substitution variable (&) into a local variable of type varchar2. You will need to convert the types and round them to nearest tens un

Reviews

Write a Review

 
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd