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Although, the essential features of E-R diagrams are enough to design many database situations. Though, with more difficult relations and advanced database applications, it is need to move to enhanced features of E-R models. The three such features are:
In this part, we have described them with the help of an example. More detail on them are available in the further readings and MCS-043.
Example: A bank has an account entity set. The accounts of the bank can be of two parts:
The statement as above shows a specialisation/generalisation hierarchy. It can be shown as
Figure: Generalisation and Specialisation hierarchy
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What are the advantages of creating a table from existing table?
Lost Updates : Suppose the two transactions T3 and T4 run simultaneously and they happen to be interleaved in the following way (suppose the initial value of X as 10000):
Ways for Selecting Data Structure Algorithms operate on data structure. Therefore, selection of the best algorithm means selecting the best data structure from whole bunch. Th
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Normalize the given relation to 3NF, justifying each step
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