Join operation processing system in relational model

摘要: The present invention discloses a join operation processing system in relational model where data base mechanism provides at least maximum/minimum calculation execution means, reduction sort means and the means. During for generating new table linking tuples of plurality pertinent tables based on common field or fields, minimum extraction range determining to be processed is determined with respect fields each which considered as object join. rate thereby improved by omitting referring unwanted data.