Question
Present ages of A and B are in the ratio 5:7. After 8
years, the ratio becomes 7:9. Find A's present age.Solution
Let present ages be 5x and 7x. After 8 years: (5x + 8)/(7x + 8) = 7/9 9(5x + 8) = 7(7x + 8) 45x + 72 = 49x + 56 16 = 4x x = 4 A's present age = 5x = 20 years
In a star schema, what is the main advantage of using surrogate keys in fact tables?
Data cleansing is primarily concerned with:
In a data warehouse, which type of table stores quantitative data for analysis?
Which of the following is NOT a common OLAP operation?
Which of these is not a typical data warehouse characteristic?
Which of the following is used to maintain information about the structure of a data warehouse?
What is meant by 'cardinality' in data modeling?
Which of the following is a key process in ETL?
A star schema in a data warehouse consists of:
Which operation in OLAP allows selecting a single dimension from a cube?
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