Method, system and database terminal for mining approximate dictionary rules in database
A database and rule technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as low efficiency, poor performance, and inability to adapt to the needs of big data analysis and processing
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[0097] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0098] Related concepts
[0099] Consider the database r, define the set of all columns in r as R, and the different values in each column are called items (item), and the set of all items is defined as item set I; each row of r is called transaction t (transaction),
[0100] (1) Support: For a given itemset Define its support degree supp(X) as the number of transactions containing item set X in r, which satisfies number of transactions.
[0101] (2) Superset, subset: For two itemsets X, Y, if satisfy Then it is said that Y is a superset of X, X is a subset of Y, and there is supp(Y)<=su...
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