MS SQL Server和CouchDB之间的区别

1. MS SQL Server：
Microsoft SQL Server是一个依赖于平台的关系数据库管理系统(RDBMS)，它既是GUI也是基于命令的软件。它支持公司IT环境中的各种事务处理，商业智能和分析应用程序。它由Microsoft Corporation开发，最初于1989年4月24日发布。它使用C和C++语言编写。

2. CouchDB：
Apache CouchDB是面向开源文档的NoSQL数据库，它使用多种格式和协议来存储，传输和处理其数据，它使用JSON来存储数据，使用JavaScript作为其使用MapReduce的查询语言以及使用HTTP作为API。它由Apache Software Foundation开发，最初于2005年发布。它是用Erlang编写的。 MS SQL Server和CouchDB之间的区别：

S.NO.	MS SQL Server	CouchDB
1.	Developed by Microsoft Corporation and initially released on April 24, 1989.	Developed by Apache Software Foundation and initially released in 2005.
2.	MS SQL server is written in C and C++.	CouchDB is written in Erlang.
3.	The primary database model for MS SQL Server is Relational Database.	The primary database model for CouchDB is Document Store.
4.	The license for MS SQL Server is Commercial.	The license for CouchDB is open source.
5.	In MS SQL Server Data Schema is fixed.	CouchDB is Data Schema free.
6.	MS SQL Server supports XML data format.	CouchDB does not supports XML data format.
7.	MS SQL Server have predefined datatypes such as float, date, number, etc.	In CouchDB there is no predefined datatypes.
8.	MS SQL Server supports SQL.	CouchDB do not have SQL support.
9.	MS SQL Server does not supports Map Reduce method.	CouchDB supports Map Reduce method.
10.	MS SQL server supports Foreign Keys.	CouchDB does not supports Foreign Keys.
11.	MS SQL server supports ACID transactions.	CouchDB does not supports ACID transactions.
12.	MS SQL server provides Immediate Consistency method to ensure consistency in a distributed system.	CouchDB provides Eventual Consistency method to ensure consistency in a distributed system.
13.	Server operating systems for MS SQL Server are Linux Windows.	Server operating systems for CouchDB are Android, BSD, Linux, OS X, Solaris and Windows.
14.	Famous companies like Citi, Bank of America, UPS, etc uses MS SQL Server.	Famous companies like Akamai Technologies, Hothead Games, Inc., GenCorp Technologies, Vivint Solar, etc uses CouchDB.