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Home » Sql » Commands » SQL LEFT OUTER JOIN
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SQL LEFT OUTER JOIN

By Dinesh Thakur

The result of a left outer join (or simply left join) for table A and B always contains records of the “left” table (A), even if the join-condition does not find any matching record in the “right” table (B). This means that if the ON clause matches 0 (zero) records in B, the join will still return a row in the result-but with NULL in each column from B.

This means that a left outer join returns all the values from the left table, plus matched values from the right table (or NULL in case of no matching join predicate).

For example, this allows us to find an employee’s department, but still shows the employee(s) even when their department does not exist (contrary to the inner-join example above, where employees in non-existent departments are excluded from the result).

SQL> SELECT e.ename. d.dname FROM emp e LEFT OUTER JOIN dept d ON (e.deptno = d.deptno);

 

You’ll also like:

  1. SQL FULL OUTER JOIN Keyword
  2. SQL Self JOIN
  3. SQL INNER JOIN
  4. SQL CROSS JOIN
  5. SQL RIGHT JOIN Keyword
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About Dinesh Thakur
Dinesh ThakurDinesh Thakur holds an B.C.A, MCDBA, MCSD certifications. Dinesh authors the hugely popular Computer Notes blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps.

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