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SQL-JOINS 

Pooja Goel  |   Nov 4, 2019  |  Views: 28

Description:

Joins in SQL is used to combine records from two or more tables by using common values of fields in each tables.


Different Types of Joins :

 

1) INNER JOIN : Retrieves all rows from both tables when Join condition is met.

2) LEFT JOIN : Retrieves all rows from Left table and matched rows from Right table.

3) RIGHT JOIN : Retrieves all rows from Right table and matched rows from Left table.

4) FULL JOIN : Retrieves all rows from Right or Left table when there is match .

5) SELF JOIN : Table is joined with itself, then Retrieves rows from tables.

 

Syntax : 

SELECT T1.column_name,T2.column_name
FROM table1 T1, table1 T2
WHERE condition

Example : 

“Employee” and “Department” tables having the following records


 





The following queries for all Joins will join both tables.

 

INNER JOIN

Query:

SELECT E.Name, E.Salary, D.Department from Employee E INNER JOIN  Department D
 ON E.DepartmentId=D.ID

Output: 

 

 

 

LEFT JOIN

Query:

SELECT E.Name, E.Salary, D.Department from Employee E LEFT JOIN  Department D
 ON E.DepartmentId=D.ID

Output: 





RIGHT JOIN

Query:

SELECT E.Name, E.Salary, D.Department from Employee E RIGHT JOIN  Department D
 ON E.DepartmentId=D.ID

Output: 




FULL JOIN

Query:

SELECT E.Name, E.Salary, D.Department from Employee E FULL JOIN  Department D
 ON E.DepartmentId=D.ID

Output: 



Comments:
Content Contributor
Pooja Goel

Pooja Goel

Sr. Software developer at Damco Solutions Pvt. Ltd.  |   Noida, Uttar Pradesh, India

I am a sr. software developer working on technologies like SQL, SSIS, SSRS, DB2,Tableau, ASP.NET having 7 years of experience.


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