Rijndael加密算法是分组长度可变的分组密码。分组长度，密钥长度可以为128，192，256比特。 假设加密的中间结果为状态State。状态State可以用类似于元素为一字节的矩阵来表示，矩阵的行数为4，列数为Nb，Nb等于分组长度除以32。 -Rijndael encryption algorithm is the grouping variable length block cipher. Packet length, key length for the bit 128,192

SQL分组查询，这个主要是用来学习sql中分组查询的文档，这样便于使用者掌握-Grouping SQL query, which is primarily used in the study group sql query document, it is easy to master user

Data mining is the process of extracting potentially useful information from a data set. Clustering is a popular data mining technique which is intended to help the user discover and understand the structure or grouping of the data in the set accord