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Resulting set for inner join

The inner join joins the columns of every selected line on
the left- hand side with the columns of all lines on the
right-hand side that jointly fulfil the join_cond
condition. A line in the resulting set is created for every
such line on the right-hand side. The content of the column
on the left-hand side may be duplicated in this case. If
none of the lines on the right-hand side fulfils the
join_cond condition, no line is created in the resulting
set.

Resulting set for outer join

The outer join basically creates the same resulting set as
the inner join, with the difference that at least one line
is created in the resulting set for every selected line on
the left-hand side, even if no line on the right-hand side
fulfils the join_cond condition. The columns on the right-
hand side that do not fulfil the join_cond condition are
filled with null values.

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