Workaround for outer join with an IN operator in Oracle

Question

I am using Oracle SQL, so outer joins have the nice (+) syntax. I should warn you that I am not allowed to redesign the database; I work for a large organization.

He

Answer 1

If you really know the Oracel SQL syntax for a "proper" Oracle database, you could also do this...

SELECT p.Name,
       a.Attribute
  FROM people p,
       (SELECT PersonID,
               Attribute
          FROM attributes
              WHERE Attribute = 'Happy'
              OR Attribute = 'Grouchy') a
  WHERE p.personid = a.personid(+)

The point being that ANSI vs Oracle syntax is a ridiculous comment. Oracle supports both, you whichever is easier/better/manageable for you.

Answer 2

First of all, why can't you use proper OUTER JOINs?, you can use them in Oracle without having to do the implicit joins with the (+) syntax. As for your problem, you can use IN:

SELECT p.Name, a.Attribute
FROM People p
LEFT OUTER JOIN Attributes a
ON p.PersonID = a.PersonID AND a.Attribute IN ('Happy','Grouchy')

Answer 3

Sorry to answer my own question. To avoid the error ORA-01719, I changed everything to "proper" joins at the advice of @Lamak, and then went with this solution:

SELECT p.Name, a.Attribute
FROM People p
LEFT OUTER JOIN  (SELECT PersonID, Attribute
                  FROM Attributes
                  WHERE Attribute = 'Happy' OR Attribute = 'Grouchy') a
ON (p.PersonID = a.PersonID)