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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.
Preliminary entities and attributes of human resourse management database management system
What is the use of unique function? UNIQUE function: If UNIQUE is specified then only unique values are used to computed the mean.
We define a view in SQL through using the create view command. To describe a view, we must provide the view a name and must state the query in which computers the view. The form of
Write a program within embedded SQL to associative the total trip expenses of the salesman named ‘John' for the relations. EXEC SQL BEGIN DECLARE SECTION; long total_expenses;
In the architecture of a database system which external level used? In the architecture of a database system view external level used.
assignment
What are the purpose for having variable length records? What kinds of separator characters are required for each? Variable-Length Records - Variable-length records are thos
How does a query tree represent a relational algebra expression? Ans: This includes transforming an initial expression (tree) into an equivalent expression (tree) that is
Which is an advantage of view? The Advantages of view is Data security, Derived columns and Hiding of complex queries
Illustrate how you can use QBE to perform logical AND and OR operation
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