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Tuesday, June 19, 2018

Database Fundamentals, as well as SQL Language Elements

SQL Tutorial 4: Database Fundamentals

i) Database Fundamentals

ii) SQL Language Elements
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i) Database Fundamentals

• Database Server instance contains multiple databases
• Database contains multiple Tables
• Table contains multiple records (rows together with columns)

What is a Database?

• Influenza A virus subtype H5N1 Database is a systematic collection of data.
• Databases back upwards storage together with manipulation of data
• Databases brand information management easy.

Table together with Record

• Influenza A virus subtype H5N1 Table inward a Relational Database is a predefined format of rows together with columns that define an entity.
• Each column contains a differnt type of attribute together with each ror coresponds to a unmarried record
• Each Table is provided amongst a name.

Example: Table name: Students

SID        Name   Address    ContactNo
10001      abcd   errtt,ttt    9878787878
10002      xyz   fwew,er    8786767676

What is DBMS?

• Influenza A virus subtype H5N1 Database management System is software designed to assistance inward maintaining together with utilizing large collection of data.

• The alternative to role a DBMS is to shop the information inward files together with write application specific code to cope it.

Using a DBMS to cope information has many advantages:

• Data Independence
• Efficient Data Access
• Data Integrity together with security
• Data Administration
• Concurrent Access together with Data Recovery
etc...

Types of Database Management System

1) Hierarchical DBMS
2) Network DBMS
3) Relational Database Management System (RDBMS)
Ex: Oracle, MS SQL Server, MySQL, DB2 etc...
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ii) SQL Language Elements

1) Identifiers: 
Names of Database Objects such equally Tables, Views, Columns etc...

2) Data Types:
Define the type of information that is contained past times a Column

3) Constants:
Symbols that correspond specific information types

4) Operators:
Perform Arithmetic, Comparison, together with Logical Operations

5) Functions: Built-in Functions to perform specific operations

6) Clauses: 
Constituent components of statements together with queries.

7) Expressions:
Produce scalar values, or tables containing of columns together with rows of data.

8) Queries: 
Retrieve the information based on specific criteria, this an of import chemical element of SQL.

9) Statements Etc...
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Create - It is a Command

Create Database gcreddyabc - It is a Statement

Oracle

Create Database gcreddyabc - It do a Database called gcreddyabc inward Oracle RDBMS

MS SQL Server

Create Database gcreddyabc - It do a Database called gcreddyabc inward MS SQL Server RDBMS
------------------------------------------ Database Server instance contains multiple databases Database Fundamentals, together with SQL Language Elements
Use / Practice SQL 

SQL is used to communicate amongst databases, it is the Standard Language for
Relational Database management Systems.

Database Engine is required to use/practice SQL Commands/Queries, nosotros tin role any
Database Engine either Oracle, MySQL or MS SQL Server etc...

MS SQL Server:
MS SQL Server is a Commercial Software only Microsoft providing Free Edition also.

Microsoft SQL Server Express Edition

Download together with Install MS SQL Server Express Edition
(Windows seven - MS SQL Server 2014 Express Edition, 
Windows x - 2014 or 2016 Express Edition)

After In Editor, 
Write SQL statements together with Execute.
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Sumber http://www.gcreddy.com/

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