Relational databases aren't like programming languages. They don't have array types.
关系数据库不同于编程语言，它们不具有数组类型。
The use of these languages has been extended to the relational model.
这些语言的使用已经扩展到了关系模型中。
Just like their friends who program in statically typed languages, programmers of Python and in other dynamic languages often use relational databases as a back-end data store.
正如采用静态类型化的语言进行编程的朋友们一样，Python和其他动态语言的程序员通常使用关系数据库作为后端数据存储区。
The expressive power of XQuery is comparable to the criterion of "relational completeness" defined for database query languages, though no such formal standard has been defined for an XML data model.
XQuery的表达能力可以与为数据库查询语言定义的“关系完整性”标准相比，虽然还没有为XML数据模型定义这样的正式标准。
Among the many query languages, Structured query language (SQL) is a language designed and optimized for querying certain kinds of relational databases.
在众多查询语言之中，结构化查询语言(SQL)是一种针对查询特定类型的关系库而设计和优化的语言。
The derived relational algebra operators are widely used in the relational database query languages.
关系代数的派生算子在关系数据库查询语言中得到了广泛应用。
Based on this model, this paper constructs two different kinds of medium relational database query languages: medium relational calculus and medium relational algebra.
给出了中介关系数据模型，在此基础上构造了两类不同的中介关系数据库查询语言：中介关系演算和中介关系代数。
The extensions enable construction of compositional APIs that have equal expressive power of query languages in domains such as relational databases and XML.
这些扩展使得结构性API构造具有与其他领域（如关系数据库和XML）中查询语言同等的表达能力。
The extensions enable construction of compositional APIs that have equal expressive power of query languages in domains such as relational databases and XML.
这些扩展使得结构性API构造具有与其他领域（如关系数据库和XML）中查询语言同等的表达能力。
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