- Data Structure
- Networking
- RDBMS
- Operating System
- Java
- MS Excel
- iOS
- HTML
- CSS
- Android
- Python
- C Programming
- C++
- C#
- MongoDB
- MySQL
- Javascript
- PHP
- Physics
- Chemistry
- Biology
- Mathematics
- English
- Economics
- Psychology
- Social Studies
- Fashion Studies
- Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Amit Diwan has Published 103 Articles
Amit Diwan
8K+ Views
RDMS Terminologies include Database, Table, Columns, etc. Let us see them one by one −DatabaseDatabase is a collection of tables like , , etc.TableA table is a collection of rows and columns , for example, StudentIdStudentNameStudentRank052Tom1035David2077John3ColumnColumn is in a table −RowRow is also called a tuple in RDBMS. A relation in ... Read More
Amit Diwan
4K+ Views
Alternate Key or Secondary Key is the key that has not been selected to be the primary key, but are candidate keys. However, it is considered a candidate key for the primary key.A candidate key not selected as a primary key is called alternate or secondary key. Candidate key is ... Read More
Amit Diwan
4K+ Views
In 6NF, the relation variable is decomposed into irreducible components. A relation is in 6NF, only if, It is in 5NF, and every join dependency on the relation is trivialLet us see an example −Enrollment_NoNameMarksThe possible join dependencies for the above would be −{Enrollment_No, Marks}{Enrollment_No, Name}In Sixth Normal Form (6NF), ... Read More
Amit Diwan
4K+ Views
A relation is in DKNF when insertion or delete anomalies are not present in the database. Domain-Key Normal Form is the highest form of Normalization. The reason is that the insertion and updation anomalies are removed. The constraints are verified by the domain and key constraints.A table is in Domain-Key ... Read More
Amit Diwan
5K+ Views
What is a Secondary KeySecondary Key is the key that has not been selected to be the primary key. However, it is considered a candidate key for the primary key.Therefore, a candidate key not selected as a primary key is called secondary key. Candidate key is an attribute or set ... Read More
Amit Diwan
3K+ Views
Entity in DBMS can be a real-world object with an existence. To identify entity from a given problem, follow the below given tips −Under the problem description, try to find the entity.Search for nouns, like Teacher, Doctor, etc.Classify nouns to get a wider picture about the entities.Read the problem description ... Read More
Amit Diwan
16K+ Views
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
Amit Diwan
4K+ Views
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
Amit Diwan
470 Views
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
Amit Diwan
13K+ Views
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 Continue Learning Please Login
Login with Google