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If anyone knows the answer of the following questions thn plz share.


Aggregates are generated by given data can we do vice versa? Support your answer with example


Identify the given statements as correct or incorrect and justify your answer in either case:
(i) 'When attributes or records are missing in extracted data then the data is semantically dirty'.
(ii) 'Pattern-based data cleansing technique identify outlier field and records using values of Mean and Standard Deviation'.


Extract, Transform, Load (ELT) process consist of steps which are _______.

>Independent and interrelated

>Independent or interrelated

>Dependent and interrelated

>Dependent or interrelated


Data Extraction from source system is a difficult task because systems are _______.

> Homogeneous


> Identical

> Standardized


If w is the window size and n is the size of data set, then the complexity of merging phase in BSN method is _______.

> O (n)

> O (w)

> O (wn)

> O (w log n)


Normally Selectivity of query in data warehouse is _______.

> High

> Low

> Not measured


Cube operation pivot?


Operations of MOLAP with an example?

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