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Describe the advantage of State chart Diagram
A state chart represents a state machine, emphasizing flow of control from one state to other. A state machine is a behaviour which specifies sequence of states that an object passes through during life time in response to events together with its response to those events. A state is a situation / condition during object's life which performs some activity or waits for some event. It contains simple states, transitions, composite states, actions, and events. The notation for multiple states depending on action / events based on set of activities is shown as:
Figure: State diagram for multiple activities
does tables are called relations
Preliminary entities and attributes of human resourse management database management system
explain cascading rollback
Define data model? A data model is a collection of conceptual tools for explaining data, data relationships, data semantics and consistency constraints.
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
Aggregate functions Some of these functions are min, count, max, and avg. These functions help in getting consolidated information from a set of tuples. Example:
Describe the candidate key functions ? Candidate Key and Alternate Key: In some instances, an entity will have more than one attribute which can serve as a primary key. Any key
CREATE YOUR DATABASE TABLES Your database project must have a minimum of four tables. Include the SQL scripts used to create the tables in your documentation. Explain the tables
Question: AirwaysCentre, an international airline booking company currently uses a relational database system for their operations, which includes the following relations: P
Analyzing Association Traversal Till now, we have supposed that associations are bi-directional. But in the case of traversal, it is in only one direction in any application,
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