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Define instance and schema?
Instance: Collection of data stored in the data base at a certain moment is
Schema: The overall design of the data base is known as the data base schema.
What does Aggregation mean?
Implementation and SQL Applications
Briefly describe the different kinds of users of a DBMS. Ans: Different sorts of DBMS users are: (a) Software Engineers: These are the people accountable for developing ap
What are composite objects? Objects that have other objects are known as complex objects or composite objects.
Define a relation ? Relation - A relations is a named two-dimensional table of data. Mathematically, a relation can be described as a subset of the cartesian product of a lis
What are aggregate functions? And list the aggregate functions supported by SQL? Aggregate functions are functions that take a collection of values as input and return a one va
discuss the purpose of the concurrency control?
Write short notes on extension and intension? In any data model, it is significant to distinguish among the description of the database and the database itself the description
What are the properties of transaction? There are three properties of transactions :- A) Atomicity B) Consistency C) Isolation
An ideal data dictionary should have everything a DBA wants to know about the database. 1 Conceptual, External, and internal database descriptions. 2. Descriptions of attr
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