What is the difference between Outer join and Full outer join?
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Answer Posted / bukko
A join is between 2 tables (or views), for example:
TABLE1 <==> TABLE2
A LEFT OUTER JOIN returns all rows from the LEFT table (TABLE1 in the example) and only the rows from the RIGHT table (TABLE2) where the columns in the join clause match.
A RIGHT OUTER JOIN is, unsurprisingly, the same but reveresed, i.e. all rows from TABLE2 plus the rows from TABLE1 where the columns in the join clause match.
A FULL OUTER JOIN is both; it returns all rows which would result if it were a LEFT OUTER JOIN plus all the rows which would result if it were a RIGHT OUTER JOIN.
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