计算顺序
1、 括号具有最高优先级;
2、 然后是一元运算符SKIP和WHILE,并具有相同的优先级;
3、 接着是二元运算符,其中AND优先级最高,其次是OR;
优先级示例:
Filter1 AND Filter2 OR Filter
is evaluated as
(Filter1 AND Filter2) OR Filter3
Filter1 AND SKIP Filter2 OR Filter3
is evaluated as
(Filter1 AND (SKIP Filter2)) OR Filter3
您可以使用括号明确的控制计算顺序。