LINKAGE SECTION描述了来自另一个程序的数据。

The LINKAGE SECTION describes data from another program.

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假设在一天中最忙的时间里，有200个应用程序连接到例1中所描述的数据库上。

Suppose during the busiest time of the day, there are 200 applications connecting to the database described in Example 1.

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SQL在某种意义上来说是一种在程序中只描述感兴趣的数据的声明性语言，而不是为获得数据的算法。

SQL is a declarative language in the sense that only the data of interest is described in the program, not the algorithm for obtaining the data.

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