Community driven content discussing all aspects of software development from DevOps to design patterns. If you plan to do database development with Java and MySQL, the first thing you’ll need to do is ...

Earlier this month, Oracle — which has long marketed its range of proprietary database systems — published the 9.0 version as an "Innovation Release" of MySQL. MySQL 9.0 is now among the three ...

When developing database-driven .NET and .NET Core, regardless of the database we intend to deploy in the end, we will often want to work with a database engine that is lightweight and fast, in order ...

PK: Stands for Primary Key. It uniquely identifies each record in a table. There can be only one Primary Key in a table. NN: Stands for Not Null. It indicates that a column cannot have a NULL value.

Null pointer exceptions are no fun. You can avoid them and keep your code clean and maintainable by using these techniques to elegantly handle null values in C#. When working on applications in any ...

从上述结果可以看出，count(*)和count(name)的值不一样，即当使用的是 count(name) 查询时，就丢失了两条值为 NULL 的数据。 解决 ...

近期由测试反馈的问题有点多，其中关于系统可靠性测试提出的问题令人感到头疼，一来这类问题有时候属于“偶发”现象，难以在环境上快速复现；二来则是可靠性问题的定位链条有时候变得很长，极端情况下可能要从 A 服务追踪到 Z 服务，或者是从应用代码 ...