Use of the ROLLUP operator with a GROUP BY clause is appropriate to summarize columns from independent dimensions.
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Q1: Data warehouses have four distinguishing characteristics.Data warehouses
Q3: ROLAP (Relational OLAP)and MOLAP (Multidimensional OLAP)are similar
Q4: The two tiered data warehouse architecture incorporates
Q5: HOLAP (Hybrid OLAP)involves both relational and multidimensional
Q6: In a star schema,dimension tables may violate
Q7: The level of detail and amount of
Q8: At this time,there is no major relational
Q9: Data in a data warehouse is usually
Q10: An oper mart is a just-in-time data
Q11: Data in a data warehouse is time-variant,which
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