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What is a SELECT operation?
The select operation selects tuples that please a given predicate. We use the lowercase letter σ to denote selection.
sir, could anybody help me in getting complete information about the mentioned topic
What are axioms? Axioms or rules of inference give a simpler technique for reasoning about
Explain DML with some examples? DML - Data Manipulation Language: statements used for managing data within schema objects. Some examples: • SELECT - retrieve data from the a da
Describe Data Manipulation language ? Data Manipulation Language (DML) - A data manipulation language is a language which enables users to access or manipulate data as organize
State the terms Designing the database and Normalization Designing the database: Out of the ERD we have formed, it is very easy to verify the tables, the attributes which the
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
Define weak and strong entity sets? Weak entity set: entity set that do not have key attribute of their own are known as weak entity sets. Strong entity set: Entity set that
WHY SHOULD NULL IN A RELATION BE AVOID AS possible?
Define tuple variable Tuple variable is a type of variable whose domain is the set of all tuples.
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
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