left vs outer join code example

Example 1: inner join vs outer join

INNER JOIN:
is used when retrieving data from multiple
tables and will return only matching data.


FULL OUTER JOIN:
is used when retrieving data from
multiple tables and will return both
table records, matching and non-matching.

Example 2: right outer vs left outer join

LEFT OUTER JOIN:
is used when retrieving data from
multiple tables and will return
left table and any matching right table records.

RIGHT OUTER JOIN:
is used when retrieving data from
multiple tables and will return right
table and any matching left table records