Coding SQL UPDATE statements that operate against a set of predefined catalog views.

对针对一组预先定义的目录视图进行操作的SQL update语句进行编码。

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A virtual catalog capability might leverage such a read-only pattern, as there's no need (or perhaps no ability) to update the preferred source.

虚拟目录功能可以利用这种只读的模式，因为它不需要(或者可能没有能力)更新首选信息源。

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For example, in an eCommerce site, popular items might be retrieved thousands of times per hour, but the merchant might update its catalog only once a day.

例如，在一个 eCommerce 站点中，受欢迎的项目可能会有每小时上千次的检索量，而商家可能一天只更新目录一次。

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