Question: Briefly compare the following concepts. You may use an example to explain your point ( s ) . a . Snowflake schema b . Galaxy

Briefly compare the following concepts. You may use an example to explain your point

(

) .

.

Snowflake schema

.

Galaxy schema

.

Star schema

.

Data cleaning

.

Data transformation

Suppose that a data warehouse consists of the three dimensions time, doctor, and patient, and the two measures count and charge, where charge is the fee that a doctor charges a patient for a visit.

.

Enumerate three classes of schemas that are popularly used for modeling data warehouses.

.

Draw a schema diagram for the above data warehouse using one of the schema classes listed in a

.

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