DOT NET CORE INTERVIEW
QUESTIONS AND ANSWERS Pdf notes
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DOT NET CORE INTERVIEW
QUESTIONS AND ANSWERS

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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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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 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.