A vertical axis title can be displayed parallel to the axis
Indicate whether the statement is true or false
TRUE
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Excel formulas resemble algebraic formulas
Indicate whether the statement is true or false
In the accompanying figure, Item 4 refers to the ____.
A. toolbar B. title bar C. status bar D. sidebar
A site created with ____ provides visitors with familiar page layout and navigation tools.
A. a template B. a browser C. styles D. divs
Answer the following questions (and explain how you arrived at your solutions).
Consider the following relations that represent part of a real estate database:
Agent(Id, AgentName)
House(Address, OwnerId, AgentId)
Amenity(Address, Feature)
The Agent relation keeps information on real estate agents, the House relation has information
on who is selling the house and the agent involved, and the Amenity relation provides
information on the features of each house. Each relation has its keys underlined.
Consider the following query:
SELECT H.OwnerId, A.AgentName
FROM House H, Agent A, Amenity Y
WHERE H.Address=Y.Address AND A.Id = H.AgentId
AND Y.Feature = '5BR' AND H.AgentId = '007'
Assume that the buffer space available for this query has 5 pages and that the following statistics and indices are available:
- Amenity:
10,000 records on 1,000 houses, 5 records/page
Clustered 2-level B+ tree index on Address
Unclustered hash index on Feature, 50 features
- Agent:
200 agents with 10 tuples/page
Unclustered hash index on Id
- House:
1,000 houses with 4 records/page
Unclustered hash index on AgentId
Clustered 2-level B+ tree index on Address
(a) Draw a fully pushed query tree corresponding to the above query.
(b) Find the best query plan to evaluate the above query and estimate its cost.
(c) Find the next-best plan and estimate its cost.