Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Expert Solution & Answer
Chapter 2, Problem 17E
Explanation of Solution
Relational query languages:
- The query language is a language is a language in which user requests information from the
database . - The query languages are higher level when compared to the standard
programming languages. - The Query languages can be categorized to three that are, imperative, functional and declarative.
Imperative query language:
- In the imperative query language, the system needs to perform specific sequence of operations on the database to compute the desired result.
- The imperative paradigm is one that the hardware of the computer is based on.
- With enough software the user can implement Object-Oriented programming, functional Programming, and Logical programming in the imperative paradigm...
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Given the following Extended-BNF grammar of the basic mathematical expressions:
Show the derivation steps for the expression: ( 2 + 3 ) * 6 – 20 / ( 3 + 1 )
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Whentheuserenters!!,themostrecentcommandinthehistoryisexecuted.In the example above, if the user entered the command:
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The ‘ls -l’ command should be executed and echoed on user’s screen. The command should also be placed in the history buffer as the next command.
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The ‘ps’ command should be executed and echoed on the user’s screen. The command should also be placed in the history buffer as the next command.
Error handling:
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Activity No.
Activity
Time (weeks)
Immediate Predecessors
1
Requirements collection
3
2
Requirements structuring
4
1
3
Process analysis
3
2
4
Data analysis
3
2
5
Logical design
50
3,4
6
Physical design
5
5
7
Implementation
6
6
c. Using the information from part b, prepare a network diagram. Identify the critical path.
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