Explain relational database with it's example.

-

 RELATIONAL DATABASES

A relational database is a form of database that stores and allows access to data elements that are connected. Relational databases are based on the relational model, which is an easy-to-understand method of expressing data in tables. In a relational database, each row in the table is a record with a unique ID called the key. The columns of the table carry data attributes, and each record generally includes a value for each attribute, making it simple to construct links between data points.

In a relational database, each table, also known as a relation, includes one or more data categories in columns, also known as attributes. Each row, also known as a record or tuple, includes a unique instance of data, or key, for the columns' stated categories. Each table has a unique primary key that identifies the data in the table. The relationship between tables may then be defined using foreign keys, which are fields in one table that are linked to the primary key of another table.

A normal business order entry database, for example, might have a table that identifies a client, with columns for name, address, phone number, and so on. Another table would explain an order: the product, the client, the date, the sales price, and so on. A user of a relational database can then acquire a view of the database that is tailored to their requirements. A branch office manager, for example, would want a view or report on all clients who purchased items after a given date. A financial services manager in the same organization may acquire a report on accounts that needed to be paid using the same tables.


A Relational Database Example

Here is a simple example of two tables that a small firm may use to process product orders. The first table is a customer information table, which means that each entry contains a customer's name, address, shipping and payment information, phone number, and other contact information. Each piece of information (each attribute) is in its column, and each row is assigned a unique ID (a key) in the database. Each entry in the second table-a customer order table-includes the ID of the customer who made the purchase, the product ordered, the quantity, the size, and color are chosen, and so on-but not the client's name or contact information.

The only thing these two tables have in common is the ID column (the key). However, because of the shared field, the relational database may establish a link between the two tables. When the company's order processing application submits an order to the database, the database can go to the customer order table, pull the correct product order information, and use the customer ID from that table to look up the customer's billing and shipping information in the customer info table. The database system can then fetch the proper product, the client will receive the order on schedule, and the firm will be compensated.



Comments

Post a Comment

Popular posts from this blog

Suppose that a data warehouse consists of the four dimensions; date, spectator, location, and game, and the two measures, count and charge, where charge is the fee that a spectator pays when watching a game on a given date. Spectators may be students, adults, or seniors, with each category having its own charge rate. a) Draw a star schema diagram for the data b) Starting with the base cuboid [date; spectator; location; game], what specific OLAP operations should perform in order to list the total charge paid by student spectators at GM Place in 2004?

-
Image
  b) The specific OLAP operations to be performed are: 1. Roll-up on date from date id to year. 2. Roll-up on spectator from spectator id to status. 3. Roll-up on location from location id to location name. 4. Roll-up on the game from game id to all. 5. Dice with status= “students”, location name= “GM Place”, and year=2004
Read more

Define Business ethics . Explain its significance.

-
Image
Business ethics   Business ethics are moral principles that guide the way a business behaves, wrong Acting in an ethical way involves distinguishing between right and then making the right choice. Business ethics are applied or professional ethics. They may take the form of actions within written and unwritten codes of principles, and values and are determined by an organization's culture. They largely govern the decisions in the organization. However, determining what practices are ethical or not is more difficult since the lines between ethical and unethical can become blurred. The following are some of the notable definitions of business ethics Decenzo & Robbins Ethics commonly refers to a set of rules or principles that defined right and wrong conduct. Ricky W. Griffin Ethics is an individual's personal beliefs about whether a behavior, action o decision is right or wrong. Managerial ethics are the standard of behavior the guides individual managers in their work. Clara...
Read more

Short Note on Security Architecture of E-governance

-
Image
 Security Architecture The security architecture of E-governance is a high-level document that sets the security goals of the e-governance project and describes the procedure that needs to be followed by all the e-governance hierarchies such as users, businesses, operators, etc. An appropriate legal framework is absolutely essential for the systematic and sustained growth of e-governance. Protection of Public Order and Decency  The internet is highly capable of being a saturated and versatile medium at the same time. Its reach is very vast and due to its multimedia capability, its impact can be immediate and profound. So the government has to beware of its potential to create a negative impact on society through the promotion of terrorism, pornography, communalism, violence, etc. Section 67 of the IT Act 2000 of India makes it a punishable offense to “publish or transmit or cause to be published it the electronic form, a material which is lascivious or appeals to the prurient ...
Read more