Cross Product

A method of conceptualizing the joining of multiple tables.

The cross product of two tables A x B builds a huge virtual table by pairing every row of A with every row of B.

Example: Cross product of 2x2-table A and 2x3-table B.

In general:

	A	B	A x B
Rows	N	M	N x M
Columns	C	K	C + K

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