1. 沙发座：
Couchbase Server 是一个开源、分布式、多模型 NoSQL 面向文档的数据库软件包，针对交互式应用程序进行了优化。它也被称为 Membase。它由 Couchbase, Inc. 开发，最初于 2010 年 8 月发布。
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。
Couchbase 和 MS SQL Server 的区别：
| S.NO. | Couchbase | Ms SQL Server |
|---|---|---|
| 1. | Developed by Couchbase, Inc. and initially released on August 2010. | Developed by Microsoft Corporation and initially released on April 24, 1989. |
| 2. | Couchbase is written in C++, Erlang, C and Go languages. | MS SQL server is written in C and C++. |
| 3. | The license for Couchbase is open source. | The license for MS SQL Server is Commercial. |
| 4. | The primary database model for Couchbase is Document Store. | The primary database model for MS SQL Server is Relational Database. |
| 5. | The secondary database model for Couchbase is key-value store. | The secondary database model MS SQL Server is Document Store and Graph DBMS. |
| 6. | Couchbase is Data Schema free. | In MS SQL Server the data schema is Fixed. |
| 7. | There is no Foreign Keys in Couchbase. | MS SQL server supports Foreign Keys. |
| 8. | Couchbase supports Map Reduce method. | MS SQL Server does not supports Map Reduce method. |
| 9. | Couchbase provides Eventual Consistency and Immediate Consistency methods to ensure consistency in a distributed system. | MS SQL Server only provides Immediate Consistency method to ensure consistency in a distributed system. |
| 10. | Server operating systems for Couchbase are Linux, OS X and Windows. | Server operating systems for MS SQL Server are Linux Windows. |
| 11. | Famous companies like Lockwood Publishing, Code Weavers, MSLGROUP, The Doyle Group, etc uses Couchbase. | Famous companies like Citi, Bank of America, UPS, etc uses MS SQL Server. |