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Consider a typical sales invoice that would include the following information. Design a single table to hold all of the information required to store an invoice including this info
What is object identity? An object retains its identity even if some or all the values of variables or explanations of methods change overtime.
When It is better to use files than a DBMS? It is better to use files than a DBMS when Multiple users wish to access the data.
Differentiate between horizontal & mixed horizontal fragmentation?
Improved performance: As the data is located near the site of its demand, and given the inherent parallelism because of multiple copies, speed of database access may be good for di
Indexed (Indexed Sequential) File Organisation It organises the file like a big dictionary, i.e., records are kept in order of the key but an index is stored which also allows
What is DAG? The class-subclass relationship is shown by a directed acyclic graph.eg: employees can be temporary or permanent. We might be create subclasses temporary \and perm
Differentiate between Key and superkey? Key and superkey - A key a single attribute or a combination of two or more attributes of an entity set in which is used to identify o
System error :These contain errors in database system or the OS, example, deadlocks.Such errors are fairly hard to detect and need reprogramming the erroneous components of the sys
A database to track your progress in your college program will track your progress towards graduation! A database that has information containing the classes that you have taken, c
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