inner join
     
         commonly "join", but see also "outer join" a
        relational database operation which selects rows from two
        tables such that the value in one column of the first
        table also appears in a certain column of the second table.
     
        an example in sql:
     
        	select  from a, b
        	where a.x = b.y
     
        the column names x and y in this example are often, but not
        necessarily, the same.
     
        1998-11-23
     
     
see also:
outer join relational database tables column sql