Give me a broad concept of what a data warehouse is, and
what it might be used for?
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Answer / phani kumar
Any organization keeps track of data and the current data
is only relevant to the OLTP means Online transaction
processing.
Suppose a company maintains sales data of different areas
for a particular product and it wants to know, whether a
particular area is having good sales or not.
For this it has to work on the past data for the sales made
at a particular area.
For making strategic decisions at a higher management level,
analysis needs to be made not on the historical data, which
is being maintained in the datawarehouse.
| Is This Answer Correct ? | 3 Yes | 1 No |
it maintains pre historical data
suposse ajay gone to usa yesterday,today he is in india in
normal data base like oracle current information only
availabble such as ajay is in india,but in dataware
house ''ajay gone to usa yesterday,today he is in india''
| Is This Answer Correct ? | 0 Yes | 3 No |
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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
Teradata 
