1. Neo4j ：
它是最著名的图形数据库管理系统，也是 Neo4j, Inc. 开发的 NoSQL 数据库系统。它不同于 Mysql 或 MongoDB，因为它具有与其他数据库管理系统相比的特殊功能。 Neo4j 还以非表格格式或非 Jason 格式的图形形式存储和呈现数据。在这整个数据由节点表示，在那里你可以创建节点之间的关系，这意味着整个数据库集合看起来像一个图形，这使得 Neo4j 与其他数据库管理系统不同。
2. 微软 SQL 服务器：
它是由微软公司开发并于 1989 年 4 月 24 日首次发布的关系数据库管理系统 (RDBMS)。它是用 C 和 C++ 语言编写的。它依赖于平台，并且是基于 GUI 和命令的软件。它支持企业环境中的各种事务处理、分析应用程序和商业智能。
Neo4j 和 MS SQL Server 的区别：
| S.No. | Neo4j | MS SQL Server |
|---|---|---|
| 1. | It was developed by Neo4j, Inc. | It was developed by Microsoft Corporation. |
| 2. | It was initially released in 2007. | It was initially released on April 24, 1989. |
| 3. | It is written using Java and Scala language. | It is written in C++ language. |
| 4. | Neo4j server operating systems are Linux, OS X, Solaris, and Windows. | For MS SQL Server, Server operating systems are Linux and Windows. |
| 5. | Its License is open source. | Its License is commercial. |
| 6. | Neo4j APIs and other access methods includes Bolt protocol, Cypher query language, Java API, Neo4j-OGM, RESTful HTTP, API, Spring Data Neo4j, TinkerPop 3. | APIs and other access methods include ADO.NET, JDBC, ODBC, OLE DB, Tabular Data Stream (TDS). |
| 7. | It does not support SQL. | It provides support to SQL. |
| 8. | Its primary database model is is Graph DBMS. | Its primary database model is Relational DBMS. |
| 9. | Neo4j supports programming languages which are .Net, Clojure, Elixir, Go, Groovy, Haskell, Java, JavaScript, Perl, PHP, Python, Ruby and Scala. | It supports C#, C++, Delphi, Go, Java, JavaScript (Node.js), PHP, Python, R, Ruby, Visual Basic programming languages. |
| 10. | It does not supports Partitioning methods. | In MS SQL Server tables can be distributed across several files (horizontal partitioning) and sharding is done through federation. |
| 11. | Neo4j is uesd by famous companies like medium.com., Stack, Fiverr, Fundamentei, Trendyol Group, double slash, ingsmen Software, GAPO, etc. | Famous companies like Bank of America, UPS, etc uses MS SQL Server. |