Found 115 Articles for RDBMS

Relational database service (Amazon RDS) is a fully-managed tool that makes it easier to maintain and use databases. One benefit of using Amazon RDS is its simplicity in database migration from one area to another. Copying the database server and its contents to a new region is a step in migrating an RDS database from one region to another. This article will discuss migrating Amazon RDS from one region to another. Verify the Database Instance Confirming that the database server is consistent with the destination area before starting the transfer procedure is crucial. The destination region should also support the ... Read More

Databases are like a collection of data in a well-structured and organized form. They are used in a variety of applications, from web applications to large scale systems. Databases are used to store data in tables, making it easier to access specific information. A table consists of rows and columns, where each row holds data, and the columns represent information based on these rows. Databases can be of two types: relational and non-relational. Relational databases store data in tables using SQL, while non-relational databases are designed to store data in collections, and use NoSQL to access it. Document databases are ... Read More

Introduction Functional dependencies and normalization are important concepts in relational database design. A functional dependency occurs when the value of one attribute determines the value of another attribute. Normalization is the process of organizing a database in a way that reduces redundancy and dependency. It is a crucial step in designing an efficient and effective database structure. What are functional dependencies? Functional dependencies are relationships between attributes in a database. They describe how one attribute is dependent on another attribute. For example, consider a database of employee records. The employee's ID number might be functionally dependent on their name because ... Read More

Most SQL databases are relational. Relational Databases are tabular and have a pre-determined schema that organizes the data logically. Database management solutions have evolved from the classic relational paradigm to the more flexible and scalable NoSQL approach.Some say NoSQL stands for "non-SQL, " but many refer to it as SQL. NoSQL is a non-relational database management system for certain data models. These data models don't need a schema and are scalable. It offers a system-supported alternative to relational databases' tabular format for storing and retrieving data. NoSQL databases don't require a certain schema. You can store data without worrying about ... Read More

PL/SQL is a block-structured language that combines SQL's functionality with procedural commands. In this article, we will discuss a program in PL/SQL to reverse a given number for example −Input : 98765 Output : 56789 Explanation : reverse number of 98765 is 56789. Input : 56784 Output : 48765 Explanation Reverse number of ‘56784’ is ‘48765’.Approach to find The SolutionTake out the last digit from the number by finding the remainder of num/10.Now add the last digit to another variable reversed_num.Now check if num becomes 0 −If YES, then go to STEP1.If NO, then go to STEP4.Finally, print the ... Read More

It is a procedural extension language (PL) for the structured query language (SQL) and the Oracle relational database. It provides a built-in, interpreted and OS independent programming environment.Apart from Oracle it also available Times Ten in-memory database and IBM DB2.The Syntax of PL/SQL is based on ADA and Pascal programming languages. PL/SQL is tightly integrated with SQL.PL/SQL offers the following −Extensive error checking.Numerous data types.Variety of programming structures.PL/SQL supports the following −Structured programming through functions.Procedures and object-oriented programming.Development of web applications and server pages.PL/SQL block structureIt defines the type of block (procedure, function, anonymous) and the way it is called, it declares ... Read More

We are given a positive integer of digits and the task is to calculate the count of odd and even digits in a number using PL/SQL.PL/SQL is a combination of SQL along with the procedural features of programming languages. It was developed by Oracle Corporation in the early 90's to enhance the capabilities of SQL.PL/SQL is one of three key programming languages embedded in the Oracle Database, along with SQL itself and Java. Input int number = 23146579 Output count of odd digits in a number are : 5 count of even digits in a number are : 3Explanation − ... Read More

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 hand, foreign key is used to maintain relationship between two tables. The primary key of a table acts as the foreign key in another table. The Foreign key in a table helps enforce Referential Integrity constraint. Read this tutorial to find out more about Primary and Foreign keys and how ... Read More

Database Management System or DBMS essentially consists of a comprehensive set of application programs that can be leveraged to access, manage and update the data, provided the data is interrelated and profoundly persistent. Just like any management system, the goal of a DBMS is to provide an efficient and convenient environment in which it becomes easy to retrieve and store the information into the database. It goes without mentioning that databases are used to store and manage large amounts of information. To achieve this, the following are the absolute must-haves: Data Modeling − It is all about ... Read More

What is NoSQL?As per the official Wiki definition: “A NoSQL (originally referring to “non SQL” or “non relational”) database provides a mechanism for storage and retrieval of data that is modeled in means other than the tabular relations used in relation databases (RDBMS). It encompasses a wide variety of different database technologies that were developed in response to a rise in the volume of data stored about users, objects and products, the frequency in which this data is accessed, and performance and processing needs. Generally, NoSQL databases are structured in a key-value pair, graph database, document-oriented or column-oriented structure.Over decades ... Read More