SQL joins queries in DBMS and its Types.

1. SQL Joins
Presents by Bilal Bhatti

2. E-ID E-name Address
01 ABID CHTRAL
02 AZAM SIALKOT
03 BILAL GUJRAT
Employee
D-no D-name E-ID
145 HR 01
432 Admin 02
301 IT 03
Department
Must have
common attribute
JOIN=cross product+conditions

3.  Natural
 Self
 Equi

4. E-ID E-name Address
01 ABID CHTRAL
02 AZAM SIALKOT
03 BILAL GUJRAT
04 ATIF LHR
D-no D-name E-ID
D1 HR 01
D2 Admin 02
D3 CS 04
Department
Employee
Find the E-names who is working in a department..?

5. E-ID E-name Address D-no D-name E-ID
01 ABID CHTRAL D1 HR 01
01 ABID CHTRAL D2 Admin 02
01 ABID CHTRAL D3 CS 04
02 AZAM SIALKOT D1 HR 01
O2 AZAM SIALKOT D2 Admin 02
02 AZAM SIALKOT D3 CS 04
O3 BILAL GUJRAT D1 HR 01
03 BILAL GUJRAT D2 Admin 02
03 BILAL GUJRAT D3 CS 04
O4 ATIF LHR D1 HR 01
04 ATIF LHR D2 Admin 02
04 ATIF LHR D3 CS 04
Matrix
rule
m*n
Select E-name from Employee , Department where emp.E-id=Dept.E-id

6. E-ID E-name Address D-no D-name E-ID
01 ABID CHTRAL D1 HR 01
02 AZAM SIALKOT D2 Admin 02
04 ATIF LHR D3 CS 04
Select E-name from Employee
Natural join Department;

7. S-id C-id Year
S1 C1 2017
S2 C2 2018
S3 C3 2019
Student SELECT T1.S-id FROM Student as T1,
Student as T2
Where T1.S-id=T2.S-id
And
T1 C-id<>T2.C-id
Biodata Marks record

8. Select E-name from Employee , Department
where emp.E-id=Dept.E-id
And
Emp.address=Dept.campus
Concept of same attributes doesn’t matter in equi

9.  It is also known as right join
 It is similar to left outer join
 It gives the matching rows and the rows
which are in right table but not in left table
 In venn diagram it is represent as given below

10. Emp Dept
Dept-No Dept-
name
Location
D1 IT Lahore
D2 SE Sialkot
D3 CS Islamabad
D4 Math Lahore
Emp-no Emp-
name
Dept-No
Emp1 Azam D1
Emp2 Bilal D2
Emp3 Fahad D3
SelectEmp-no,Emp-name,Dept-name,Loc FromEmpRight
outer join Dept
On Emp.Deptno=Dept.Deptno

11. Employe no Employe name Dept name Location
Emp1 Azam IT Lahore
Emp2 Bilal SE Sialkot
Emp3 Fahad CS IslaMABAD
- - Math Lahore