What do you mean by Data and Information?
Database Management System > Introduction to DBMS > DBMS Overview
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Answer:
Data are plain facts. The word "data" is plural for "datum." When data are processed, organized, structured or presented in a given context so as to make them useful, they are called Information. It is not enough to have data (such as statistics on the economy). Data themselves are fairly useless, but when these data are interpreted and processed to determine its true meaning, they becomes useful and can be called Information.
Examples of Data and Information:
| Data | Process Description | Information |
|---|---|---|
| Census data | Sort records based
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Answer:
Elements of Database as follows:
Answer:
A relation is used to represent information about any entity and its relationship with other entities in the form of attributes (or columns) and tuples (or rows). It comprises a relation schema and a relation instance.
Answer:
A relational database is a collection of relations (or two-dimensional tables) having distinct names. It is a persistent storage mechanism that conforms to the relational model.
Answer:
The number of attributes in a relation is known as degree or arity.
Answer:
The number of tuples in a relation is known as cardinality. |