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What are Joins? (Views: 1449)


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Sometimes we have to select data from two or more tables to make our result complete. We have to perform a join.
Joins can be categorized as:
Inner joins (the typical join operation, which uses some comparison operator like = or <>). These include equi-joins and natural joins.
Inner joins use a comparison operator to match rows from two tables based on the values in common columns from each table. For example, retrieving all rows where the student identification number is the same in both the students and courses tables.
Outer joins can be a left, a right, or full outer join.

Submitted By: Anonymous | Created On: 5/16/2009 5:00:41 PM



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