Life cycle of database begins with analysis and defining of the problems and objectives.The following figure displays the life cycle of a database that begins with analysis, including feasibility study −Let us see the steps involved −AnalysisIn the first phase, the current system’s operation is analysed and problems are defined. ... Read More

The 5NF (Fifth Normal Form) is also known as project-join normal form. A relation is in Fifth Normal Form (5NF), if it is in 4NF, and won’t have lossless decomposition into smaller tables.You can also consider that a relation is in 5NF, if the candidate key implies every join dependency ... Read More

A primary key having two or more attributes is called composite key. It is a combination of two or more columns.An example can be −Here our composite key is OrderID and ProductID −{OrderID, ProductID}Let us see another example −StudentIDStudentEnrollNoStudentMarksStudentPercentageS001072172257090S002072179049080S003072176644086Above, our composite keys are StudentID and StudentEnrollNo. The table has two attributes as primary ... Read More

What is 1NF1NF is First Normal Form in DBMS, applied on an unnormalized table to make it normalized.  An unnormalized table has the following issues we need to avoid to get a perfect database design −Problems with Unnormalized TableData RedundancyStoring same data item multiple times is known as Data Redundancy.Let ... Read More

BigData and NoSQL are the choice for database solutions nowadays, but that does not mean the crucial features of RDBMS will die. Since 90% of the world data produced in last some years, therefore the need for RDBMS will not end in the near future.The RDBMS market is incrementing with ... Read More

An attribute is fully functional dependent on another attribute, if it is Functionally Dependent on that attribute and not on any of its proper subset.For example, an attribute Q is fully functional dependent on another attribute P, if it is Functionally Dependent on P and not on any of the ... Read More

To set flex items to be of equal width column, use the flex-fill class. The class displays the items as equal width. In the below example screenshot, you can see that we have four flex items with equal width columns −The flex-fill class is used for every flex items and ... Read More

The history of data models had three generations of DBMS −Hierarchical System was the first generation of DBMS. The first generation also came with the CODASYL system. Both of them introduced in 1960s.The second generation includes the Relational Model. Dr. E.F.Codd introduced it in 1970.The third generation includes Object-Relational DBMS ... Read More

Easily include jQuery library into your HTML code directly from Content Delivery Network (CDN). Google and Microsoft provide content delivery for the latest version.You can try to run the following code to learn how to use Google CDN for jQuery:ExampleLive Demo           jQuery CDN     ... Read More