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