DBHW1.pdf - SE305 Database System Technology Assignment 1 Zhenhao Cao 515030910559 September 2018 1 Explain the difference between physical and logical

DBHW1.pdf - SE305 Database System Technology Assignment 1...

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SE305 Database System Technology Assignment 1 Zhenhao Cao 515030910559 September 2018 1. Explain the difference between physical and logical data independence Physical data independence : The ability to modify the physical scheme without the necessity to rewrite application programs. For example, changing from sequential to random access files. Logical data independence : The ability to modify the conceptual scheme without the necessity to rewrite application programs. For example, adding a field to a record. 2. List seven programming languages that are procedural and two that are non-procedural. Which group is easier to learn and use? Explain your answer. Procedual : C, C++, Java, Basic, Pascal, Fortran, Cobol Non-procedural : Lisp, Prolog Procedural languages are relatively easier to learn. By using such languages, programmers can concentrate more on the task to be done, instead of how to do it. This explains why most green hands start with procedural languages.
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