Oracle left outer join null values

Collectives on Stack Overflow. Learn more. Asked 8 years, 6 months ago. Active 8 years, 6 months ago. Viewed 7k times. Why am I wrong? Revious Revious 7, 30 30 gold badges 92 92 silver badges bronze badges.

Add a comment. Active Oldest Votes. By the way this is what we observe from your result: No condition is not null in where cond is null in where cond 2 2 rows from the main tables have no corresponding ids in the joined table. In our example, Employee is the left-hand side table. The following is the SQL Script. Once you execute the above SQL query, you will get the following result set which includes only the Male employees.

There are two employees for which there is no entry exists in the Projects table i. So, what our requirement is, we want to retrieve only those two employees for which there are non-matching records exist in the Projects table. So, basically, we want to retrieve only the non-matching records from the left side table. The following Left Outer Join Query with the where clause does the same.

It is also possible in Oracle to join more than two tables. The 2nd is a local predicate on the employee rows. The result of the query is shown below. As shown in this result, the 3rd and 5th rows return the departments in Toronto and Boston respectively, but with no associated employees. Toronto has no employees at all, and Boston has no employee earning more than , Create a free Team What is Teams?

Collectives on Stack Overflow. Learn more. Asked 13 years, 1 month ago. Active 8 years, 11 months ago. Viewed 23k times. Add a comment. Active Oldest Votes.