单目操作符(unaryoperator)是通过在关键字operator后跟单目运算符符号来命名的。
A unary operator is named by using the key word operator followed by the unary operator symbol.
清单3中的示例显示可以如何将此操作符与 ! $ 运算符组合使用。
The example in Listing 3 shows how you can use this operator in combination with the !$ operator.
所以这是相等操作符，然而那个单等号是一个赋值运算符。
So this is the equality operator, whereas the single equal sign is the assignment operator.
操作可以是一个关系运算符，或者系统或用户定义的函数，也可以是一个sql操作符，例如GROUPBY、ORDER BY等。
An operation can be a relational operator, a system - or user-defined function, or an SQL operator, such as GROUP BY, ORDER BY, and so on.
操作可以是一个关系运算符，或者系统或用户定义的函数，也可以是一个sql操作符，例如GROUPBY、ORDER BY等。
An operation can be a relational operator, a system - or user-defined function, or an SQL operator, such as GROUP BY, ORDER BY, and so on.
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