What is normalization? Explain different levels of
normalization?
- 8 Answers
- 59831 Views
- CG-VAK, Choice Solutions, College School Exams Tests, IBM, Wipro, I also Faced
- E-Mail Answers
Answer Posted / subhash vandewar
Normalizatiin is the scientific method of breaking down
complex table sturcture into simple table structure by
using certain rules.using this method you can reduce
redundency in a table and eliminate the problem of
inconsisteny and disk space usage.
First Normal Form(1NF):
a table is said to be in first normal form when each
cell of the table prcisely contain one value.
Second Normal Form (2NF):
a table is said to be in second normal form when it is
in 1NF and every attribute in the row in functionaly
dependent upon whole key and not just a part of key.
Third Normal Form (3NF):
a table is said to be in second normal form when it is 2NF
and every non key attribute is functionaly dependent only
on the primary key.
| Is This Answer Correct ? | 27 Yes | 7 No |
Post New Answer View All Answers
In which table collections errors are stored.
explain detail about ftp in datastage?
If a column is an image value type, how you can compare column values? How can you use this column in join clause?
You have two tables with a one to many join based on a field named id. You need to find records in the parent table that are not represented in the child table. how would you accomplish this?
A) Which two are benefits of Teradata's support for ANSI Standard SQL? (Choose two.) 1.data is distributed automatically 2.queries get optimized to better plans 3.submit queries from other database systems 4.can interface with BI tools B) Which statement is true when comparing the advantages of third normal form to star schema? 1.Star schema tends to have fewer entities. 2.Star schema requires additional data storage. 3.Third normal form tends to have fewer entities. 4.Third normal form requires additional data storage. C)Which two sets of functions does the Parsing Engine (PE) perform? (Select two.) 1.sorting, formatting, and aggregating of the final answer set 2.flow control of the data to and from the participating tables 3.SQL statement interpretation, syntax validation, and semantic evaluation 4.dispatching the step execution sequence to the AMP via the BYNET D) Which two can be achieved with Teradata Active System Management (TASM)? (Choose two.) 1.disable hardware 2.react to hardware failure 3.influence response times 4.collect metadata E) Which three mechanisms can be used to ensure security within the Teradata Database? (Choose three.) 1.views 2.spool limits 3.roles 4.access rights 5.profiles
I HAVE A PI ON COL A THE NEXT DAY I WANT CHANGE THE PI ON COL B? PLS SEND ME THE ANS
What is the maximum length of an extended property?
What is DB Development software?
How you can make a parameterized view?
What are the types of database model?
Explain about query and reporting.
You have a table with three columns: amount1, amount2, and amount3 in a single row only one of these three columns will have a value and the other two will be null. Write a sql query to retrieve the values from these columns?
On friday, you issued several insert statements using query analyzer. You then verified the data had been correctly entered with a select statement on monday, your users report that the data is not there what happened?
Write short notes on manual refreshes.
Explain about normal forms?
