An annihilator, in the context of differential equations, is a differential operator that, when applied to a given function, yields zero. More formally, if L is a differential operator and f(x) is a ...

QLExpress4 支持用 Java 语言自定义语法，包括自定义 function，自定义 operator 和 自定义扩展函数。 但是定义它们所需继承的类不同，如果用户需要将同一逻辑应用在三个方面，就需要定义三个类。 但是在 QLExpress3 中只需要一个对象继承并实现 Operator，就可以调用三 ...

We are working on a large database migration project where our client (SaaS provider) has 300 databases, where the name of the database looks like [ClientName-AppDB] where there are three databases ...