On 8/2/06, Chris Hoover <revoohc@xxxxxxxxx> wrote:
Question, What is the difference between left join, and left outer join? I know the difference between inner and outer joins, but I was thinking that left join == inner join. But from what I am now seeing, it appears that PG is equating left join to left outer join. Is this correct?
Types of JOIN: * [ INNER ] JOIN * LEFT [ OUTER ] JOIN * RIGHT [ OUTER ] JOIN * FULL [ OUTER ] JOIN * CROSS JOIN As usual, "[ .. ]" means that that word can be omitted. "left join == inner join" is absolutely incorrect, I'm afraid you need to refresh you memory and read the manual (http://www.postgresql.org/docs/8.1/interactive/sql-select.html, find "join_type"). This part of Postgres conforms to standard, all major DBMSs follow this semantics too. -- Best regards, Nikolay
