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Write short notes on tuple relational calculus.
The tuple relational calculation is anon procedural query language. It defines the desired information without giving a particular procedure for obtaining that information.
cardnality ratio for humanresource mangement system
Hierarchical model is also known by? A hierarchical model is also known as a Tree structure.
What is object identity? An object retains its identity even if some or all the values of variables or explanations of methods change overtime.
Our company hires independent contractors to install equipment at precise locations across North America. We want to track the installation data and generate reports. The compan
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What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
WOUND-WAIT
There are a number of possible solutions to the open ended brief. One of the simple ones is shown here without the PKs and FKs. It is important to think of how a number of tasks
For every n-ary relationship type R where n>2, we make a new table S to represent R. We contain as foreign key attributes in s the primary keys of the relations that show the parti
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