If a column contains 7 values and 6 distinct values, the cardinality is __________
(a) 7
(b) 6
(c) 13
(d) 1
(a) 7
(b) 6
(c) 13
(d) 1
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Right choice is (b) 6
Best explanation: In MySQL, the cardinality of a column is the number of distinct values that it contains. A column that contains the values 1, 2, 3, 4, 4, 5, 6 has a cardinality of six and not seven.