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Control as a State Machine Engine
First let us define the state machine: "the state machine is a machine which is an object but not an application object. It is a part of language substrate to support syntax of application object". The normal approach to implement control is to have a few ways of explicitly representing and executing state machines. For illustration, a general "state machine engine" class can provide capability to execute a state machine represented by table of transitions and actions provided by application. As you know, each object consists of its own independent state variable and can call on the state engine to determine next state and action.
This approach helps quickly progress from analysis model to a skeleton prototype of system by defining classes from object model, state machines from dynamic model and creating "stubs" of action routines. A stub can be termed as "the minimal definition of a subroutine or function without any internal code". So, if every stub-print out own name, this technique permits you to execute skeleton application to verify which the basic flow of control is correct or not.
State machine mechanisms can be created easily using the object oriented language.
Group By clauses • It is used to group database tuples on the basis of definite common attribute value like as employees of a department. WHERE clause still can be used
Consider the table student and list names of students in the departments other than maths and computer. SELECT std_name FRM student WHERE dept_name NOT IN (‘Maths','Computer);
#quCreate a database design specification (Enhanced Entity Relationship Diagram (EERD) and Relational Data Model (RDM)) from the given business description. The RDM must be in 3rd
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Problem 1 What is a Data Warehouse? Mention its advantages 2 Explain the Top-Down and Bottom-up Data Warehouse development Methodologies 3 What is Data Transformation? Ex
What are multiple inheritances? Multiple inheritances allow a class to inherit variables and methods from many super classes.
we need example of 2phase locking
Do you have experts of the dbms
Self-Join: In a self join a table is joined with itself. Let consider the following sample partial data of EMP table EMPNO ENAME MGRID
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