| 术语 | key match |
| 释义 | key match 关键字匹配 The relationship between the key value specified in an operation and the contents of the key field of the record retrieved. There are three kinds of key matches:an exact match indicated that the key field of the record accessed must exactly match the key value specified in the operation; an approximate match means that the contents of the key field of the record accessed may be equal to or greater than the specified key value; in a generic key match only an initial portion of the key value is specified, and the record accessed is the first such occurrence of a record whose key field begins with those characters. The generic and approximate key matches may be combined. 在操作中指定的关键字值和被检索记录的关键字字段中的内容之间的那种关系。有三种 类型的关键字匹配: 严格匹配,表示所访问的记录的关键字段必须和操作中指定的关键字值 完全一模一样; 近似匹配,表示所访问的记录的关键字段中的内容可以等于或大于指定的关 键字值; 一般的键匹配,只指定关键字值的初始部分,则关键字段中由这些字符打头的第一 个出现的记录即为被存取的记录。一般键匹配和近似匹配可以组合起来使用。 |
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