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The types of joins I know of are
- Rajesh Konda May 06, 2009inner join
outer join
left outer join
right outer join
inner join - join two tables and show only those rows/records where the criteria match.
outer join - join two tables and show all the rows/records regardless of the criteria match. When criteria don't match, column values from left table or the right table would be nulls
left outer join - same as outer join except if criteria don't match, only the columns from the left table will have values.
right outer join - the other way around of left outer join.
Use inner join if criteria match is important for you. Use other join if you want to see all the data.