Are any of the utilities discussed in this chapter located in more than one directory on the local system? If so, which ones?
What will be an ideal response?
No. However, some commands that are built into a shell have counterparts
that exist as executable files (for example, echo).
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Find out the names and number of years worked along with their department names in descending order by number of years worked.
Use the NamanNavan (N2) Corporation database tables to design the following queries. (Use the spooling method to capture all queries and results in the CHAP7SP1.LST file.)
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.
What is the name of the pre?CompTIA A+ certification?
A. CompTIA Network Security+ B. CompTIA IC3 certification C. CompTIA Certified Network Associate (CCNA) D. CompTIA IT Fundamentals
When configuring settings in a mandatory access control environment, which of the following specifies the subjects that can access specific data objects?
A. Owner B. System C. Administrator D. User