当关系数据库刚开发出来的时候，情况就是这样。但是，幸运的是，许多开发商同意开发一个标准的语言，用来访问和操纵数据库。

When relational databases were first developed, this was the case; but, fortunately, a number of vendors agreed to develop a standard language for accessing and manipulating relational databases.

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结构化查询语言(Structured Query Language, SQL)：一种标准化语言，用于在关系数据库中定义对象及操纵数据。

Structured Query language (SQL) : a standardized language used to define objects and manipulate data in a relational database.

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数据库必须支持至少一个确切的定义语言包括数据定义，数据操纵，数据完整和数据库事务控制等功能。

The database must support at least one clearly defined language that includes functionality for data definition, data manipulation, data integrity, and database transaction control.

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