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What are the Issues when Selecting a Database
Issues when Selecting a Database
Consider the subsequent relations along with keys underlined Street (name, location, city) House (number, street_name) Lives (name, house_number) Define the above relations
Logical Operators Rules of Precedence: Order evaluated Operator 1 All comparison operators 2
, write the relational schema, and draw the new dependency diagrams. Identify the normal forms for each table structure you created
What is the difference among a database schema and a database state? The collection of information stored in database at particular moment in time is known as database state a
Why does a DBMS query language is designed? A DBMS query language is designed to support end users who use English-like commands. support in the development of complex applicat
What is the use of rename operation? Rename operation is used to rename both relations and an attributes. It uses the as clause, taking the form: Old-name as new-name.
1. Staff(staffID, firstName, lastName, availabilityID, experience, phone, mobile, email); 2. Availability(availabilityID, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday,
Domain Constraint It shows that each attribute in a relation has to contain an atomic value only from the corresponding domains. The data types associated with commercial RDBMS
what is Mapping Constraints? with examples
Describes the several relationship constraints through giving suitable example? Constraints on relationships: There are two kinds of constraints on relationships. 1) Mapping
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