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See Oracle JOIN syntax in plain English

SearchOracle expert Rudy Limeback has published an excellent overview of the SQL-99 OUTER JOIN syntax, and explain how the new syntax compares to the older (+) outer join notation::
An OUTER join returns all rows from one table, plus matching rows, if any, based on the join condition, from the other table. There are three types of OUTER joins. LEFT OUTER joins and RIGHT OUTER joins are identical, and the difference is entirely based on which table you mention first. So the following two queries will both return the same results:
select columns
  from table1
left outer
  join table2
    on = table2.t1_id
select columns
  from table2
right outer
  join table1
    on table2.t1_id =

Important: make sure you understand why the above two queries are identical. Note which table is named first in the FROM clause.


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