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A relation has:
Relational Schema:
A relational schema shows the relation's name, its attributes and the domain of every attribute. If R is the name of a relation and A1, A2...An is a list of attributes showing R then R (A1, A2...An) is known as a relational schema. Every attribute in this relational schema takes a value from some explicit domain called Domain (Ai).
For instance, the relational schema for relation PERSON as in Figure will be: PERSON (PERSON_ID:integer, NAME: string, AGE:integer, ADDRESS:string)
Total number of attributes in a relation indicates the degree of a relation. Hence the
PERSON relation includes four attributes, so this relation is of degree 4
Define tuple variable? Tuple variables are used for comparing two tuples in the same relation. The tuple variables are explained in the from clause by way of the as clause.
What is conceptual schema? The schemas at the view level are known as subschema that describe dissimilar views of the database.
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Define page. The database is partitioned into some number of fixed-length blocks, which are referred to as pages.
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Illustrate how you can use QBE to perform logical AND and OR operation
What does conceptual design work? A conceptual design involves modelling independent of the DBMS.
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