SQL Training Institute in Ambala ! Batra Computer Centre

Email: info.jatinbatra@gmail.com
BATRA COMPUTER CENTRE
ISO CERTIFIED 9001:2008
Website: www.batracomputercentre.comPh. No.: 8222066670, 4000670

Introduction
๏A Business need
๏Database
“An organized collection if information”
Or
“Set of tables each having different class of data”

Structured Query Language (SQL)
๏ A language to communicate with the database
๏ A tool to retrieve the required information from database
๏ Elements
» Syntax of SQL is in plains English
» To question the database

What SQL can do?
1. Execute queries against a database
2. Perform CRUD function:
» CREATE  New database
 New table in a database
 Records in a database
» READ  Retrieve data from a database
» Update  Update Records in a database
» DELETE  Delete records from a database

Pre – requisites for SQL
๏ Relational Database
๏ Tables
๏ Fields
๏ Records
๏ Different Relationships
» 1-1
» 1-m

SYNTAX

SQL Queries

Function Queries
Function queries in SQL involve manipulating functions
in SQL statements to retrieve desired information from
the database
Such function queries are of two board categories:
» Aggregate Function queries
» Scalar Function queries

SQL join Queries
SQL joins are used to query data from two or more tables,
based on a relationship between certain columns in these
tables.

Inner Join
The Inner JOIN keyword return rows when there is
an least one match in both tables
Syntax
SELECT column_name(s)
FROM table_name1
INNER JOIN table_name2
ON table_name1.column_name=table_name2.column_name

Outer Join
The outer join clause differs from the INNER JOIN in that row
are returned even when there are no matches through the JOIN
criteria on the second table.
Difference Explained:
Assuming you’re joining on columns with no duplicates, which is by
far the most common case:
An Inner join of A and B gives the results of A intersect B, i.e. the inner
part of a Venn diagram intersection
An outer join of A and B gives the results of A union B, i.e. the outer
parts of a Venn diagram union

Left Outer Join
The left JOIN Keyword returns all rows from the left table
(table_name1), even if there are no matches in the right table
(table_name2)
Syntax
FROM table_name1
LEFT JOIN table_name2

Right Outer Join
The RIGHT JOIN Keyword Return all rows from the right table
(table_name2), even if there are no matches in the left table
(table_name2)
Syntax
FROM table_name1

Full Join
The FULL JOIN keyword return rows when there is a match in one of the
tables.
Syntax
FROM table_name1

ADDRESS:
SCO -15, Dayal Bagh,
Near Hanuman Mandir
Ambala Cantt-133001
Haryana
Ph. No.: 9729666670, 8222066670 &0171-4000670
Email ID: info.jatinbatra@gmail.com
Website: www.batracomputercentre.com

SQL Training Institute in Ambala ! Batra Computer Centre

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