The dimensions are defined in the CREATE table statement and storage is reserved for each combination of values.
在CREATEtable语句中定义维的时候，就为每种值的组合预留了存储空间。
An expression is a combination of values, variables, and operators.
表达式是数值，变量和操作符的组合。
The pseudo-random number is a complex, linear combination of values of input sequences provided to the generator and exhibits little correlation with such input values.
该伪随机数是提供给发生器的输入序列值的复线性组合，与该输入值相关性很小。
If a primary key consists of more than one column, duplicate values are allowed in one column, but each combination of values from all the columns in the primary key must be unique.
如果主键由一列以上组成，则其中一列允许重复值，但是主键中所有列的值的每种组合必须是唯一的。
If a primary key consists of more than one column, duplicate values are allowed in one column, but each combination of values from all the columns in the primary key must be unique.
如果主键由一列以上组成，则其中一列允许重复值，但是主键中所有列的值的每种组合必须是唯一的。
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