vu eng101 Mid Term Subjective Solved Past Paper No.2
vu eng101 English Comprehension Solved Past Papers
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Total Completeness constraint:
Total Completeness constraint exist only if we have a super type and some subtypes associated with that supertype, and the following situation exists between the super type and subtype. All the instances of the supertype entity must be present in at one of the subtype entities, i.e.-there should be not instance of the supertype entity which does not belong to any of the subtype entity.
Partial Completeness Constraint
This type of completeness constraint exists when it is not necessary for any supertype entity to have its entire instance set to be associated with any of the subtype entity. This type of situation exists when we do not identify all subtype entities associated with a supertype entity, or ignore any subtype entity due to less importance of least usage in a specific scenario.
(Page 103)This is the level of DFD which provides the least amount of details about the working of the system. Context DFDs have the following properties:
They always consist of single process and describe the single system. The only process displayed in the CDFDs is the process/system being analyzed. Name of the CDFDs is generally a Noun Phrase.
No System details are shown in the Contexts DFDs just context is shown. Input and output from and to the process are shown and interactions are shown only with the external entities.
In the context level DFDs no data stores are created. Ant dataflow from external entities are only directed toward the purported system and vice versa, no communication is show between external entities themselves.
The level 0 Diagram in the DFD is used to describe the working of the whole system. Once a context DFD has been created the level zero diagram or level "notdiagram is created. The level zero diagram contains all the apparent details of the system. It shows the interaction between a numbers of processes and may include a large number of external entities. At this level it is the duty of the designer to keep a balance in describing the system using the level 0 diagram. Balance means that he should give proper depth to the level 0 diagram processes. Because placing too much details and showing all of the miniature processes in the level 0 diagrams makes it too much complex. On the other hand it is also not recommended to just ignore even larger processes of the system, because in such a case although the level 0 DFD will become simple but now we will have to create large number of detail DFDs. So a balance in describing the system should be kept so that the depth of the Level 0 DFD is manageable.
Subordinating Conjunctions
A subordinating conjunction introduces a dependent clause and indicates the nature of the relationship. Among the independent clause(s) and the dependent clause(s). The most common subordinating conjunctions are "after," "although," "as," "because," "before," "how," "if," "once," "since," "than," "that," "though," "till," "until," "when," "where," "whether," and "while." Each of the highlighted words in the following sentences is a subordinating conjunction:
After she had learned to drive, Alice felt more independent.
The subordinating conjunction "after" introduces the dependent clause "After she had learned to drive."
If the paperwork arrives on time, your cheque will be mailed on Tuesday.
I (accept/except) all your compliments, but I (advice/advise) you to offer (fewer/less) of them at a time because (its /it's) not good for a person to hear too many positive things about himself in one day.
