如果一个等式,在所讨论的范围里不是对字母的所有允许值都成立,而是仅当字母满足某些条件时才能使等式成立,这样的等式叫做条件等式。例如:当x=3时,4x=12;当a=5时,a+5=10,2a-6=3a-11。
方程又称为条件等式,因为其中的未知量通常只允许取某些特定的值。
Equipment is called an equation of condition in that it is true only for certain values of unknown quantities in it.
这是基于经验数据而得出的特定表达式,一般而言,该等式在特定条件下方成立。
It's a specific statement based on empirical data, and its truth is generally confined to a certain set of conditions.
过滤条件可以指定为列名,其后跟等式、不等式或布尔运算符,然后是过滤值。
Filter criteria are specified as the column name, followed by an equality, inequality, or Boolean operator, followed by the filter value.
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