Ebay Interview Question for Software Engineer / Developers

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Join is used to combine two or more tables to retrieve the output. Natural join is subdivided into two- inner join and outer join.
In Inner join two attr from two diff tables are checked and if equal the matching tuples are retrieved and the dangling tuples are eliminated.
In outer join there are three - left outer , right outer, full outer
left outer matching tuples are displayed and the dangling tuples from the left table are displayed.
right outer - the same as above instead the dangling tuples from the right table are displayed.
full outer - the same as above and the dangling tuples from both the relations are displayed.

- Karthik July 06, 2012 | Flag Reply

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