Relational operators

Relational operators generate a boolean result .

关系运算符生成的是一个布尔（Boolean）结果。

It can be composed of multiple subexpressions that use the different relational operators supported in Python .

它可以包括多个使用Python中支持的不同关系运算符的子表达式。

You can put available collations in effect to impact relational operators eq , le ,, and so forth .

可以让选择排列生效，影响关系运算符eq、le等。

That 's certainly a departure from Java 's use of relational operators , but it should become relatively intuitive after your first few queries .

这肯定与Java相关的操作符用法大相径庭，但是在完成你的头几个查询之后，它应该变得相对直观一些。

The program ope - rators and the logical operators are unified as relational operators in the first-order temporal logic .

在一阶时态逻辑中，程序算子与逻辑算子被统一地看成一个关系算子。

In order to extend database system to manage data on tertiary storage , the relational operators , especially the join operation , are one of the key problems that must be resolved .

为了使数据库管理系统能够联机使用第3级存储设备，第3级存储设备上的关系操作算法，特别是连接操作算法是必须解决的关键问题之一。

Assuming an ASCII system , this is precisely equivalent to path / followed by anything whatsoever , but because it 's just relational operators , it used the index .

假设使用了一个ASCII系统，它完全等效于后跟一些内容的path/，但是，因为它只是一个关系运算符，所以它使用了索引。

The sample data flow needs two XML Relational Mapping operators .

示例数据流需要两个XMLRelationalMapping操作符。

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。

Temporal Extension of Relational Algebra Operators

关系代数操作符的时态扩展

This paper introduces the concept of generalized fuzzy relation and extends relational algebra operators such as union , intersection , difference , Cartesian product , selection , projection etc.

文中引入了广义模糊关系的概念，讨论了广义模糊关系代数的操作：广义模糊并、广义模糊交、广义模糊差、广义模糊笛卡尔积、广义模糊投影和广义模糊选择等。