Briefly describe an outer join ?

A left outer join retains all of the rows of the “left” table, regardless of whether there is a row that matches on the “right” table. What are the “left” and “right” tables? That’s easy – the “left” table is simply the table that comes first in the join statement – in this case it is the Employee table, it’s called the “left” table because it appears to the left of the keyword “join”. So, the “right” table in this case would be Location.

Outer Join: Display all the record of one table and the only matching record for second table.