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




Oracle left outer join

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What is Oracle Left outer join ?

  • Left outer 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.
 left outer join

Syntax:

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

SELECT wikitechy_employee.id, wikitechy_employee.name, orders.orderid
FROM wikitechy_employee
LEFT 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:
 left outerjoin database
  • We have another table called orders with three fields (id, customer_name, and orderid).
 left outerjoin  customer database
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Left Outer Join:

 left outerjoin query
  1. This LEFT OUTER JOIN example would return all rows from the wikitechy_employee table and only those rows from the orders table where the joined fields are equal (id from both the tables).
  2. The rows for Suganya, Venkat and Dharma would be included because a LEFT OUTER JOIN was used. However, you will notice that the orderId field for those records contains a <null> value.

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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