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Explain how you can define an object model of a system.
A list of terms that shall be used by end users to describe state and behaviour of objects in system.
Different user classes may need different mental models of objects in the system. This concludes:
Which type of objects there are (user objects).
What information user can know about object of a particular type (user object attributes).
How objects may be related to the other objects (relationships).
Object types with 'subtypes' that have additional specialised actions or attributes i.e., User object, User object subtype, User object action, Container objects.
A model of business objects which end users believe interact within a GUI system.
Eliminate Repeating Groups The problem is, "Find out the list of employees, who knows DB2". For this problem we require to perform an awkward scan of the list looking for re
The Maximum no of key fields that can be used in a header is?? 50
coventions for displaying an ER schema as ER diagram
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Benefits of heap files 1. This is a easy file Organisation method. 2. Insertion is somehow capable. 3. Good for bulk-loading data into a table. 4. Best if file
Express the properties of Strings? Strings can be case sensitive (or not) which can change the outcome of string operations. You can evaluate whole strings \ just part
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Consider the relation PERSON. If you want to display details of persons having age less than or equal to 30 than the select operation will be used as follows: σ AGE The resu
Draw the precedence graph of the following schedule and determine whether the schedule is serializable. (Note that all instructions, except lock and unlock, are omitted. We assume
WHAT IS SQL
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