Prepare for your Next Interview
|
Welcome to the Geeks Talk forums. You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today! If you have any problems with the registration process or your account login, please contact contact us. |
Dbms
This is a discussion on Dbms within the Database General forums, part of the Databases category; my question is how many candidate keys formed by n-attributes? pls give answer...
|
|||||||
07-30-2008
|
|||
|
|||
|
Dbms
my question is how many candidate keys formed by n-attributes? pls give answer
|
| The Following User Says Thank You to vidwans_abhinav For This Useful Post: | ||
| Sponsored Links |
|
07-30-2008
|
|||
|
|||
|
Re: Dbms
Please post your question clearly .
|
|
07-30-2008
|
|||
|
|||
|
Re: Dbms
A candidate key uniquely identifies rows in the table.
>>How many candidate keys formed by n-attributes? That depends upon your table data.
|
| The Following User Says Thank You to krishnaindia2007 For This Useful Post: | ||
|
08-16-2008
|
|||
|
|||
|
Re: Dbms
Quote:
|
|
08-19-2008
|
|||
|
|||
|
Re: Dbms
hi
what is Primary,CAndidate,Foreign,Super key and their difference.Pls give answer
|
| The Following User Says Thank You to murali_pollachi For This Useful Post: | ||
|
08-19-2008
|
|||
|
|||
|
Re: Dbms
What is Normalization.ans pls
|
|
08-26-2008
|
|||
|
|||
Re: Dbms
Normalization is the process of refining the E-R Model.
It is used to avoid the redundant data in database tables. Toomuch of normalization makes database very complex and tedious to manage. Normalization is mainly used in OLTP.. where transaction data is more important. ex. icici online banking.
|
|
08-26-2008
|
|||
|
|||
|
Re: Dbms
Hi, normalization is the process of efficiently organizing data in a database. There are two goals of the normalization process: eliminating redundant data (for example, storing the same data in more than one table) and ensuring data dependencies make sense (only storing related data in a table). Both of these are worthy goals as they reduce the amount of space a database consumes and ensure that data is logically stored. First normal form (1nf) first normal form (1nf) sets the very basic rules for an organized database: eliminate duplicative columns from the same table. Create separate tables for each group of related data and identify each row with a unique column or set of columns (the primary key). Second normal form (2nf) second normal form (2nf) further addresses the concept of removing duplicative data: meet all the requirements of the first normal form. Remove subsets of data that apply to multiple rows of a table and place them in separate tables. Create relationships between these new tables and their predecessors through the use of foreign keys. Third normal form (3nf) third normal form (3nf) goes one large step further: meet all the requirements of the second normal form. Remove columns that are not dependent upon the primary key. Fourth normal form (4nf) finally, fourth normal form (4nf) has one additional requirement: meet all the requirements of the third normal form. A relation is in 4nf if it has no multi-valued dependencies. Remember, these normalization guidelines are cumulative. For a database to be in 2nf, it must first fulfill all the criteria of a 1nf database. Hope this answers your question, you can also visit this link database normalization - wikipedia, the free encyclopedia, where it has detailed information regarding normalization thanks sushma
|
|
12-28-2008
|
|||
|
|||
|
Re: Dbms
Quote:
what is dbms? what is oo dbms?
|
|
12-28-2008
|
|||
|
|||
|
Re: Dbms
Quote:
|
|
12-29-2008
|
|||
|
|||
|
Re: Dbms
Please find all that here.
|
 |
|
| Thread Tools | |
| Display Modes | |
Linear Mode
|
|
Similar Threads
|
||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| the difference between dbms and rdbms in detail | shruti_raman | Database General | 1 | 07-29-2008 05:52 AM |
| Dbms output | babi_geek | Oracle | 2 | 03-12-2008 05:19 AM |
| dbms | jasjas | Database Design | 1 | 10-24-2007 04:23 AM |
| Query with a command in DBMS | fred | SQL | 1 | 10-01-2006 03:51 PM |
All times are GMT -4. The time now is 02:12 PM.
