1.德比：
Derby 是一个用Java实现的功能齐全的开源关系数据库管理系统 (RDBMS)，顾名思义，它是由 Apache Software Foundations 开发的。它基于Java、JDBC 和 SQL 标准。 Derby 易于安装、部署和使用。它要么嵌入到Java应用程序中，要么用作数据库服务器。
2. 微软 SQL 服务器：
Microsoft SQL Server 是一个关系数据库管理系统 (RDBMS)，它依赖于平台，并且是基于 GUI 和命令的软件。它支持企业 IT 环境中的各种事务处理、商业智能和分析应用程序。它由微软公司开发，最初于 1989 年 4 月 24 日发布。它是用 C 和 C++ 语言编写的。
Derby 和 MS SQL Server 的区别：
| SR.NO. | Derby | MS SQL Server |
|---|---|---|
| 1 | It is developed by Apache Software Foundation in 1997. | It is developed By D. Richard Hipp. in 1989. |
| 2 | It is written in Java language. | It is written in C and C++ language. |
| 3 | The primary database model for Derby is Relational DBMS. | The primary database model for MS SQL Serve is Relational DBMS. |
| 4 | Server operating systems for Derby are Windows, macOs, Linux, Unix, BSD and z/OS. | Server operating systems for MS SQL Server are Linux, Windows. |
| 5 | It has Java Stored Procedures for Server-side scripts. | It has Transact SQL, .NET languages, R, Python and (with SQL Server 2019) Java for Server-side scripts. |
| 6 | APIs and other access methods used by Derby is JDBC. | APIs and other access methods used by MS SQL Server are ADO.NET, JDBC, Tabular Data Stream (TDS)and ODBC. |
| 7 | It supports only Java programming language. | It supports C#, C++, Java, JavaScript, Visual basics, PHP, PL/SQL, Python, R, Ruby, etc. |
| 8 | It supports Master-Slave Replication methods. | It supports replication method but depending on the SQL-Server Edition. |
| 9 | It is a open source software framework. | It is a commercial databases. |
| 10 | It supports fine grained access rights according to SQL-standard. | It also supports fine grained access rights according to SQL-standard. |