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

Q1:

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

Q2:

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'.

Q3:

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

>Independent and interrelated

>Independent or interrelated

>Dependent and interrelated

>Dependent or interrelated

Q4:

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

> Homogeneous

Heterogeneous

> Identical

> Standardized

Q5:

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)

Q6:

Normally Selectivity of query in data warehouse is _______.

> High

> Low

> Not measured

Q7:

Cube operation pivot?

Q8:

Operations of MOLAP with an example?

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