In a relational database, keys are the most important elements to maintain the relationship between two tables or to uniquely identify the data from a table. Primary key is used to identify data uniquely therefore two rows can't have the same primary key. It can't be null. On the other ... Read More

WiFi is a wireless network that is used to connect nearby devices with each other and share the Internet via hotspots. The Internet, on the other hand, is a global network of networks where computers communicate with each other via Internet Protocol. Go through this article to find out more ... Read More

The "&" and "&&" operators are both logical AND operators in most programming languages, but they can behave differently in certain circumstances. Both "&" and "&&" are operators used for evaluating conditional statements. The most basic difference between the two is that the "&" operator is a logical as well ... Read More

In digital electronics, both combinational and sequential circuits are the most widely used circuits. These are two broad categories of circuits defined in the digital electronics where one type of circuit is independent of time and other is dependent on time. Read this article to find out more about combinational ... Read More

In the top-down approach, a bigger module/problem is divided into smaller modules. In contrast, in the bottom-up approach, the smaller problems are solved and then they are integrated to find the solution of a bigger problem. Read this article to learn more about top-down approach and bottom-up approach and how ... Read More

In System Design, there are two types of approaches followed namely, the Bottom-Up Model and the Top-Down Model. The bottom-up model is one in which the different parts of a system are designed and developed and then all these parts are connected together as a single unit. On the ... Read More

Tkinter events are very powerful in handling the different objects and attributes of the widgets as well as the elements of an application. There are events such as mouse events and keyboard button events that can be handled by binding the event or callback function with the button. Let us ... Read More

We normally use the Tkinter Label widget to display text and images in an application. Let us assume that we want to create an application such that the Label widget continuously gets updated with a value whenever the application executes. To achieve this, we will use a StringVar object and ... Read More

To save the contents of a Textbox in Tkinter, we can take the following steps − Create an instance of tkinter frame. Set the size of the frame using win.geometry method. Define a user-defined method "open_text" to open a text file in "read" mode. Read the contents of ... Read More

The Aloha Protocol allows several stations to send data frames over the same communication channel at the same time. This protocol is a straightforward communication method in which each network station is given equal priority and works independently.Aloha is a medium access control (MAC) protocol for transmission of data via ... Read More