file table relation

Name relationship: name, relationship to the actual name of the table. Degree of relationship (degree) of the properties of the table (or the number of columns in the table) cardinality: number of rows in a table or the number of records cafetiere recorded for a relationship.
file table relation
Multiplication defined by Cartesian (Cartesian): If two sets A, B we have the following Cartesian product A * B is displayed as BA, which includes all couples will Mrtbhayy the first couple of series A and a second pair of sets B is selected. A = {a1, a2, a3} B = {b1, b2, b3} A * B = {(a1, b1), (a1, b2), (a1, b3), (a2.b1), (a2, b2), (a2, b3), (a3, b1), (a3, b1), (a3, b2), (a3, b3)}
Three sets D1, D2, D3, consider the Cartesian cafetiere product of three sets to account for any subset of the Cartesian product is called a relation. This issue can expand the set Dn .... D1. That any subset of the Cartesian product .. Dn .... D1 * D2 * is a relation on the set. For example: if D3 = {5,6}, D2 = {2,4}, D1 = {1,3} is the Cartesian cafetiere product of three sets of accounts, and then specify a relationship on the sets? D1 * D2 * D3 = {(1,2,5), (1,1,6), (1,4,6), (3,2,5), (3,2,6), (3, 4,5), (3,4,6)} cafetiere D1 * D2 * D3 = {(2, 5), (2, 6), (4, 5), (4, 6)} = D2 * D3 (1 3) * {(2,5), (2,6), (4,5), (4,6)} = (1,2,5), (2,2,6), (2,4 , 5), (1,4,6), (3,2,5),
{1011, 1024} = IP Birth date = {1975, 1980} the Cartesian product of the three sets of samples on their account and then write two equations. For the written regards drawing table and column names of the table layout. (1,24,1011) cafetiere IP * Name * Birthday =