Definitions for "Cartesian product"
A result of a query in which two or more tables of those used are not linked by a Join. For two un-linked tables with lengths, and rows respectively, the result will contain n*m rows containing all the possible combinations of data from the two tables. A cartesian product is generally the result of incorrectly defined Joins, and can lead to incorrect results.
See Cartesian join.
the set of elements common to two or more sets; "the set of red hats is the intersection of the set of hats and the set of red things"