Oracle Left Outer Join | Left Outer Join - oracle tutorial - sql tutorial
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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.
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:
- We have another table called orders with three fields (id, customer_name, and orderid).
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Left Outer Join:
- 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).
- 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
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