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Which database level is closest to the users?
External database level is closest to the users.
Write short note on Data models? Data models: A data model is an abstract model which elaborates how data is represented and accessed. The term data model has two commonly ac
Support by Adding Indexes Multiple indexes can be used to access a data file by multiple access paths. In such a scheme only single copy of the data is consider, only the numbe
Which database object does not physically exist? A view database object does not physically exist.
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
i am required to come up with entities relationships, optionality and cardinality from a scenario. there is a night club and bookings for a musician band
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What is the difference among a database schema and a database state? The collection of information stored in database at particular moment in time is known as database state a
Explain the two types of participation constraint. Total: The participation of an entity set E in a relationship set R is said to be total if each entity in E participates i
Which operation is used if we are interested in only certain columns of a table? PROJECTION operation is used if we are interested in only certain columns of a table.
In the ER diagram, one example of subclassing is depicted following the Services entity. The subclasses Item Based and Time Based are created. The entity Services gains the attribu
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