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👉🏻What is de-normalization? De-normalization is the process of attempting to optimize the performance of a database by adding redundant data. It is sometimes necessary because current DBMSs implement the relational model poorly. A true relational DBMS would allow for a fully normalized database at the logical level, while providing physical storage of data that is tuned for high performance. De-normalization is a technique to move from higher to lower normal forms of database modeling in order to speed up database access. De-normalizing the database design allows for fewer joins with tables and foreign key requirements. This method is commonly used for Reporting and OLAP workloads.

👉🏻What is normalization? Database normalization is a data design and organizational process applied to data structures based on rules that help build relational databases. In relational database design, the process of organizing data to minimize redundancy is called normalization. Normalization usually involves dividing database data into different tables and defining relationships between the tables. The objective is to isolate data so that additions, deletions, and modifications of a field can be made in just one table and then retrieved through the rest of the database via the defined relationships. The key traits for Normalization are eliminating redundant data and ensuring data dependencies. follow @coder_baba

👉🏻What is RDBMS And Normalization? Relational Data Base Management Systems (RDBMS) are database management systems that maintain data records and indices in tables. Relationships may be created and maintained across and among the data and tables. In a relational database, relationships between data items are expressed by means of tables. Interdependencies among these tables are expressed by data values rather than by pointers. This allows a high degree of data independence. An RDBMS has the capability to recombine the data items from different files, providing powerful tools for data usage. What are the properties of the relational tables? Relational tables have the following five properties: 🚀· Values are atomic. 🚀· Column values are of the same kind. 🚀· The sequence of columns is insignificant. 🚀· The sequence of rows is insignificant. 🚀· Each column must have a unique name.

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Roll Name Class Address 1 Rahul Kumar Tiwari Class9 Varanasi UP India 2 Babita class7 Delhi 4 Master Jojo Class7 Kanpur India Select * from tbl_Student; create procedure sp_InsertStudent @Name nvarchar(50), @Class nvarchar(50), @Address nvarchar(50) as begin insert into tbl_Student(Name,Class,Address) values(@Name,@Class,@Address) end go ----------- create procedure sp_UpdateStudent @Roll int, @Name nvarchar(50), @Class nvarchar(50), @Address nvarchar(50) as begin update tbl_Student set Name=@Name,Class=@Class,Address=@Address where Roll=@Roll end go -------- create procedure sp_DeleteStudent @Roll int as begin Delete from tbl_Student where Roll=@Roll end go

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What is a Database? We will not get into more detailed explanation about the database but just a breif for undertsanding. Database is a collection of data stored in a computer disc space or server space. In simple words it is a space where your data is been stored. In a single database we can create any number of data tables. It's like a school with many classrooms and each classroom will have different school students. In a single data table we create any number of columns For eg. studentID, studentName, studentAddress and in a single data table we can store data for specific topic. Like to store student's records you can have students data table, For school accounts you can have accounts data table, For school results you can have results data table. There are commonly used databases in our IT Zone SQL - Microsoft SQL Server Oracle - Oracle RDBMS or simply as Oracle MYSQL - Open Source Freeware MSACESS - Microsoft Access PostgreSQL - ORDBMS SAP - To manage customer relationship and other business operations FoxPro - Database IBM DB2 - IBM Database by IBM Now in further we will try to understand about data manipulation statements i.e. (Insert, Select, Update and Delete). About Data Manipulation Statements Select Statement Select statement let you to retrieve the data from the database table. For ex : In simple words if you want to pick up single student record, multiple student records or all students records from the table database you just need to use "Select" statement. Example Select * from 'students' "*" - Means All

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