您要查找的是不是：
- Defines a function node in a query expression tree. 定义查询表达式树中的函数节点。
- Defines a node in a query expression tree. 定义查询表达式树中的节点。
- Defines a null value node in a query expression tree. 定义查询表达式树中的空值节点。
- Defines a parameter reference node in a query expression tree. 定义查询表达式树中的参数引用节点。
- Defines an attribute reference node in a query expression tree. 定义查询表达式树中的属性引用节点。
- Defines an entity reference node in a query expression tree. 定义查询表达式树中的实体引用节点。
- Defines the literal node in a query expression tree. 定义查询表达式树中的文字节点。
- You can use curly braces to specify query expressions. 可以使用大括号指定查询表达式。
- Just enclose the query expression in parentheses, and then apply the dot operator and call the method. 只需将查询表达式括在括号内,然后应用点运算符并调用此方法。
- If the query expression is part of a DECLARE CURSOR statement, column_alias cannot be used in the FOR UPDATE clause. 如果查询表达式是DECLARE CURSOR语句的一部分,则不能在DECLARE CURSOR中使用column_alias。
- You can use the let keyword to introduce an identifier for any expression result in the query expression. 您可以使用let关键字为查询表达式中的任何表达式结果引入标识符。
- The last Select clause in a query expression determines the return value of the query. 查询表达式中的最后一个Select子句确定查询的返回值。
- The range variable is like the iteration variable in a foreach loop except that no actual iteration occurs in a query expression. 范围变量类似于foreach循环中的迭代变量,但在查询表达式中,实际上不发生迭代。
- If the Select clause identifies a single item to return, the query expression returns a collection of the type of that single item. 如果Select子句标识了要返回的单个项,则查询表达式将返回该项的类型集合。
- If the query expression returns a Boolean true value, the effective Boolean value is true, as shown in the next example. 如果查询表达式返回布尔值True,则有效的布尔值为True,如下例所示。
- If the query expression statically results in a sequence that contains atomic values instead of nodes, a static error is raised. 如果查询表达式静态生成一个包含原子值而不是节点的序列,将产生静态错误。
- Is a query specification or query expression that returns data to be compared with the data from another query specification or query expression. 查询规范或查询表达式返回与来自另一个查询规范或查询表达式的数据相比较的数据。
- In a query expression, a from clause with multiple generators is exactly equivalent to multiple consecutive from clauses with a single generator. 在查询表达式中,多个产生器的from子句正好等价于多个连续的带有单个产生器的from子句。
- At present, there is no standard GML query method.GML query expression research is often proposed but lack of mechanism research. 但是，目前GML查询方法标准不一，都以查询语法的研究为主，缺乏机制性研究。
- As you iterate over the query expressions, your algorithm may need to correct for double negatives. 在遍历查询表达式时,算法可能需要纠正双重否定。
