by Dinesh Thakur

The database is a repository of all types of data. After storing it, there should be a mechanism to access, manipulate and update it. For this, we have a tool in the form of a query to perform all these operations. There are many query language like SQL, Search Engine Query Language (Google, Bing), DMX (Data Mining Language), etc. All these languages have different function and their function structure used for the different data model.



 
by Dinesh Thakur

The database schema is a structure or architecture to store data in the database. It creates abstraction(hide the lowest level the detail from the user) between application and physical database. A user creates a relationship with the help of Database Management System.But a user can’t see which type of data structure is used by the system to store the data in it.This data structure may be linear and may be non-linear, we don’t know. This is known as Abstraction. The database divided into three-level architecture is also known as three; schema architecture.



 
by Dinesh Thakur

The database is the location to store the data. Firstly we used excel sheet to store the data. However, it has some problem with data integrity and redundancy problem. This problem solved by E.F. Codd proposed a model in 1970. This model was straightforward. It used the concept of mathematical relation which looks like a table.



 
by Dinesh Thakur

Defination of Internet or simply "the Net" is a worldwide "network of networks". This was the next step of ARPANET and NSFNET. The World Wide Web (www) or called "the Web" is the information-sharing model of the Internet. The internet can be defined as wired or wireless a decentralized network of over million of smaller heterogeneous networks consists of a set of national, regional and private. The internet is the common language whereby dissimilar computers with various operating systems, are able to communicate with each other, using a standard set of protocols.



 
by Dinesh Thakur

The development on WI-FI technology began in 1997 when the Institute of Electrical and Electronic Engineers (IEEE) introduced the 802.11 technology that carried higher capacities of data across the network. "Wifi" means "wireless fidelity". The term "wifi" refers to (WLAN) wireless local area networks.

 
by Dinesh Thakur

Definition: Capacitor or Condenser is an insulating medium that can separate two conducting surfaces.The insulating medium is called dielectric constant or relative permittivity of the material. Most commonly used dielectric materials in the capacitor are air, mica, and paper, ceramic, plastic.

 
by Dinesh Thakur

Definition: Resistance (Represented by R) offers hindrance to the flow of current in an electrical circuit. It is measured in ohms, which is named after its developer George Simon Ohm. He is a German physicist, who has studied the relationship between voltage, current and resistance and tells us that when one volt of voltage is applied across the component and one ampere of current is passed through it, then the resistance offered by that component is one ohm. The symbol used for resistance is the Greek letter omega (Ω).

 
by Dinesh Thakur

Definition: A diode is an electronic component that allows the flow of current in only one direction and when the current flows in the other direction, then it blocks the current. The name diode is derived from the word “di-ode” which means that a device having two electrodes. Thus, a diode has two electrodes one electrode is known as the anode and the other electrodes are known as the cathode.

 

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About Dinesh Thakur

Dinesh ThakurDinesh Thakur holds an B.SC (Computer Science), MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps. For any type of query or something that you think is missing, please feel free to Contact us.



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