Self Join

We need to know about Self Join meaning ,then we can understand its purpose.I am giving a short meaning : Joining a table with it's self is known as self Join.
We can define Self join as like :
  •  Inner Self Join
  • Outer Self Join (Left,Wright & Full Join)
  • Cross Self Join
Inner Self Join :
Select A.Column_Name1, B.Column_Name1
from Table_name A
Inner Join Table_name B
On A.Primary_Table = B.Primary_Table
 Outer Self Join:
Select A.Column_Name1, B.Column_Name1
from Table_name A
Left Join Table_name B
On A.Primary_Table = B.Primary_Table
Cross Self Join:
Select A.Column_Name1, B.Column_Name1
from Table_name A
Cross Join Table_name B

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