本文已经开发了一些普通的数据库功能，例如：更新一个数据库、显示查询结果、连接两个数据表、以及使用不同的过滤条件筛选结果等。

This article has explored some common database functions such as updating a database, displaying query results, joining two tables together, and filtering the results using various filter conditions.

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数据生成器使用随机的测试数据来填充数据表，当需要大量数据集的时候这个功能特别有用。

Data generators are used to populate tables with random test data, which is especially helpful when very large datasets are needed.

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早期的频繁的客户接触与简单的需求电子数据表代替了传统的功能规格说明书和复杂的用例图。

Early and frequent customer contact combined with a simple requirements spreadsheet replace traditional functional specifications and sophisticated use case diagrams.

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