1. Microsoft SQL Server：
它是由Microsoft Corporation开发的关系数据库管理系统(RDBMS)，最初于1989年4月24日发布。它是用C和C++语言编写的。它是平台相关的，并且既是GUI也是基于命令的软件。它支持公司环境中的各种事务处理，分析应用程序和商业智能。
2. IBM DB2：
它是IBM的关系数据库管理系统(RDBMS)产品。它可以有效地分析，存储和检索数据。通过使用XML的面向对象功能和非关系结构的支持，增加了DB2产品。它是用C和C++语言编写的。
Microsoft SQL Server和IBM DB2之间的区别：
| S.NO. | Microsoft SQL Server | IBM DB2 | ||||||
|---|---|---|---|---|---|---|---|---|
| 1. | Developed by Microsoft Corporation. | Developed by IBM. | ||||||
| 2. | MS SQL Server was initially released on April 24, 1989. | IBM DB2 was initially released in 1983. | ||||||
| 3. | For MS SQL Server, Server operating systems are Linux and Windows. | IBM DB2 Server operating systems are AIX, HP-UX, Linux, Solaris, Windows, z/OS. | ||||||
| 4. | APIs and other access methods include ADO.NET, JDBC, ODBC, OLE DB, Tabular Data Stream (TDS). | APIs and other access methods include ADO.NET, JDBC, JSON style queries, ODBC and XQuery. | ||||||
| 5. | MS SQL Server supports C#, C++, Delphi, Go, Java, JavaScript (Node.js), PHP, Python, R, Ruby, Visual Basic programming languages. | IBM DB2 supports C, C#, C++, Cobol, Delphi, Fortran, Java, Perl, PHP, Python, Ruby, Visual Basic programming languages. | 6. | Secondary database models are Document store and Graph DBMS. | Secondary database models are Document store and RDF store. | 7. | In MS SQL Server tables can be distributed across several files (horizontal partitioning) and sharding is done through federation. | IBM DB2 supports Sharding Partitioning methods. |
| 8. | Famous companies like Bank of America, UPS, etc uses MS SQL Server. | Famous companies like Wells Fargo, Citi, JPMorgan Chase, Bank of America, etc uses IBM DB2. |