Full Outer Join Oracle | Full Outer Join - oracle tutorial - sql tutorial




Oracle full outer join

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What is Full outer join in oracle ?

  • Full outer join returns all rows from the LEFT-hand table and RIGHT-hand table with nulls in place where the join condition is not met.
 full outer join

Syntax:

SELECT columns
FROM table1
FULL [OUTER] JOIN table2
ON table1.column = table2.column;
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Example:

SELECT wikitechy_employee.Name, Orders.OrderID 
FROM wikitechy_employee
FULL OUTER JOIN Orders
ON wikitechy_employee.id=Orders.ID
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Sample Database:

  • We have a table called wikitechy_employee with four fields (id, name, position, and city). It contains the following data:
 oracle full outer join table 1 output
  • We have another table called orders with three fields (id, customer_name, and orderid).
 oracle full outer join table 2 output

Full Outer Join:

 oracle full outer join query and output
  1. The FULL OUTER JOIN keyword returns all the rows from the left table (wikitechy_employee), and all the rows from the right table (Orders).
  2. If there are rows in "wikitechy_employee" that do not have matches in "Orders", or if there are rows in "Orders" that do not have matches in "wikitechy_employee", those rows will be listed as null.

LEFT OUTER JOIN

  • Another type of join is called an Oracle LEFT OUTER JOIN.
  • This type of join returns all rows from the LEFT-hand table specified in the ON condition and only those rows from the other table where the joined fields are equal (join condition is met).
  • In this visual diagram, the Oracle LEFT OUTER JOIN returns the shaded area:
 left outer join

Syntax

  • The syntax for the Oracle LEFT OUTER JOIN is:
SELECT columns
FROM table1
LEFT [OUTER] JOIN table2
ON table1.column = table2.column;
click below button to copy the code. By - oracle tutorial - team
  • In some databases, the LEFT OUTER JOIN keywords are replaced with LEFT JOIN.

RIGHT OUTER JOIN

  • Another type of join is called an Oracle RIGHT OUTER JOIN.
  • This type of join returns all rows from the RIGHT-hand table specified in the ON condition and only those rows from the other table where the joined fields are equal (join condition is met).
  • In this visual diagram, the Oracle RIGHT OUTER JOIN returns the shaded area:
 right outer join
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Syntax:

  • The syntax for the Oracle RIGHT OUTER JOIN is:
SELECT columns
FROM table1
RIGHT [OUTER] JOIN table2
ON table1.column = table2.column;
click below button to copy the code. By - oracle tutorial - team
  • In some databases, the RIGHT OUTER JOIN keywords are replaced with RIGHT JOIN.

Oracle ALL Joins

Oracle join query

Oracle Join Query - Inner Join Query - Left Outer Join Query - Right Outer Join Query - Full Outer Join Query


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