所有操作符表使用的函数和操作符都必须在创建操作符表之前定义。
All the operators and functions used by an operator class must be defined before the operator class is created.
一个操作符表定义一种特定的数据类型可以如何与一种索引一起使用。
An operator class defines how a particular data type can be used with an index.
操作符表还声明索引方法在为一个索引字段选定该操作符表的时候要使用的支持过程。
The operator class also specifies the support procedures to be used by the index method when the operator class is selected for an index column.
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