标准查询运算符概述。
下面一节中列出了执行选择的标准查询运算符方法。
The standard query operator methods that perform selection are listed in the following section.
下面一节中列出了分区序列的标准查询运算符方法。
The standard query operator methods that partition sequences are listed in the following section.
以下部分列出了执行聚合运算的标准查询运算符方法。
The standard query operator methods that perform aggregation operations are listed in the following section.
以下部分列出了执行限定符运算的标准查询运算符方法。
The standard query operator methods that perform quantifier operations are listed in the following section.
查询无效：确保括号完整，自定义查询只包含有效标准数字以及布尔型运算符and、OR和NOT。
Invalid query: make sure parenthesis are balanced and the custom query consists only of valid criteria Numbers and the Boolean operators and, or, and NOT.
而关系数据库标准查询语言SQL没有除法运算符，不能直接作除法。
However, there are no division symbol in SQL, so the division can not be operated directly.
而关系数据库标准查询语言SQL没有除法运算符，不能直接作除法。
However, there are no division symbol in SQL, so the division can not be operated directly.
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