用于递增或递减循环计数器的一条或多条表达式语句。
Expression statement or statements to increment or decrement the loop counters.
与大多数现代编程语言一样，需要使用AND和OR语句对表达式或它们的值进行条件运算。
Like in most modern programming languages, the and and or statements are necessary for definitive conditional evaluations of expressions or their values.
我不喜欢编写表达式和语句。
这些简单的案例中提供了表达式，但它们也可以是规定多条语句的代码块(使用花括号)。
In these simple cases, expressions are provided, but they could also be blocks of code (using curly braces) to specify multiple statements.
只有在赋值和调用时，表达式才应被当作一条单独的语句。
The only expressions that should be used as statements are assignments and invocations.
这意味着循环体中执行的程序语句必须要改变表达式的值，否则循环将无法结束。
This means the program statements executed in the loop body must change the value of the expression — or else the loop will never end.
需要从这些属性创建SQL表达式，从而形成sql语句的联结谓词。
SQL expressions will need to be created from these attributes to form the join predicates of the SQL statement.
这一边上的属性需要转换为SQL表达式，从而形成sql语句的联结谓词。
The attributes on this side will need to be converted to SQL expressions to form the join predicates of the SQL statement.
但是为时已晚，表达式和语句的区分已经根深蒂固。
The distinction between expressions and statements was entrenched.
实际上，该遍历表达式返回具有rdf：type谓词的所有语句的对象。
In effect, this traversal expression returns the objects of all statements with an RDF: type predicate.
XQuery代码完全由表达式组成，没有语句。
XQuery code consists entirely of expressions with no statements.
一个用于读取语句和表达式的代码模型。
注意，if语句是表达式，意味着它们有值。
Note that if statements are expressions, meaning they have values.
另一个类似的频繁请求是允许非常量表达式显示为switch语句的case标签。
Another similar frequent request is to allow non-constant expressions to appear as case labels of switch statements.
它首先是SQL标准的一部分，经过演化现在包括将XQuery或XPath表达式嵌入sql语句的规范。
It evolved as part of the SQL standard effort and now includes specifications for embedding XQuery or XPath expressions within SQL statements.
或者，也可以使用表达式语言语句访问此数据。
Or you can access the data using an expression language statement.
while循环与if语句一样，支持一个可选的else子句，其中包含一个当表达式计算为False时执行的程序语句块。
The while loop, as was the case with the if statement, supports an optional else clause containing a block of program statements executed when the expression is False.
if语句支持一个可选的else子句，指示当布尔表达式计算为False时应该处理的程序语句块。
The if statement supports an optional else clause that indicates a block of program statements that should be processed if the Boolean expression evaluates False.
Python中的第二种流控制语句是while循环，它在一个表达式计算为True时执行一个程序语句块。
The second type of flow control statement in Python is the while loop, which executes a block of program statements while an expression evaluates True.
在第三章和第四章继续详细介绍表达式和语句的细节之前，非常有必要介绍一个本章例子中已经展示了的高层次的概念。
Before continuing on to consider the details of expressions and statements in Chapters 3 and 4, it is important to introduce one more high-level concept illustrated by the examples in this chapter.
Lua允许使用多种赋值语句，可以先对表达式进行求值，然后再进行赋值。
Lua allows multiple assignments, and expressions are evaluated first and are then assigned. For example, the statements
它可以识别象局部变量、实例变量、表达式以及if语句等六十多种不同的语言元素。
It can recognize something as a local variable, instance variable, expression, if statement - more than 60 language elements.
应用程序只需向DB 2服务器发送一个包含XQuery转换表达式的SQLupdate语句(图2)。
The application simply sends an SQL UPDATE statement with an embedded XQuery transform expression to the DB2 server (Figure 2).
if语句，它基于测试表达式的结果执行一个特定的语句块。
The if statement, which executes a particular block of statements based on the result of a test expression.
while循环，它当一个测试表达式为true时执行一个语句块。
The while loop, which executes a block of statements as long as a test expression is true.
对于select表达式，比如说xsl：apply - templates语句，XPath更加灵活。
For a select expression, such as XSL: apply-templates statements, the XPath is more flexible.
该检查是xsl：if语句而不是match表达式中谓词的一部分。
This check is part of an XSL: if statement rather than a predicate in the match expression.
在DB 29中，sqlquery函数将一个sql语句嵌入到XQuery表达式中。
In DB2 9, the sqlquery function is used to embed an SQL statement within an XQuery expression.
可以使用FLWOR 表达式构造同样的查询，这种表达式常常与XQuery语句相关联。
The same query can be formulated using FLWOR expressions commonly associated with XQuery statements.
olap函数可以包括在一个select列表的表达式中或select语句的ORDERby子句中。
An OLAP function can be included in expressions in a select-list or the ORDER BY clause of a select-statement.
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