Why should we use data ware housing and how can you extract data for analysis with example?

0 Answers   TCS,

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Hi Guys, I have been to L& T last week ..Please find the questions mentioned below 1)Slowly changing dimension types 2)DML statement 3)DDL statement 4)write a syntax to create database 5) differences between count(*) and count(column) 6) differences between union and union all 7) what is decode 8) what is NVL 9) Arrange the values in ascending order 10,5,20,15,null 10)Primary and surrogate key 11)what is group by clause does? 12)what is difference between truncate and delete 13)what is difference between OLAP and OLTP ? 14)Architecture of Datawarehouse 15)how do you test the data validation from source as (flat file and xml) to staging tables. 16)what is shedule and time bound the mentioned above question asked in two rounds.all the best

2 Answers   L&T,

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what are the other factors of the database on which the loading performance depend?

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Best institute for MS BI training in Hyderabad, India?

4 Answers  

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How to calculate fact table granularity?

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How are the dimension tables designed?

0 Answers  

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Explain clustering algorithm?

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What are session timeout and application timeout?

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What is Discrete and Continuous data in Data mining world?

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Which columns go to the fact table and which columns go the dimension table?

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How to handle time period attribute for time dependent data?? a.)add time period as a part of pk b.)add time period simply and make it nullablec.)add time period simply and make it not null.

1 Answers  

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Describe the differences between a data warehouse and data mart.

0 Answers  

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