1. SQLite：
SQLite 是一个提供关系数据库管理系统 (RDBMS) 的软件库。它由 D. Richard Hipp 于 2000 年 8 月设计。SQLite 的设计目标是允许程序在不安装数据库管理系统 (DBMS) 或不需要数据库管理员的情况下运行。 SQLite 中的 lite 意味着在设置、数据库管理和所需资源方面的轻量级。
2. 沙发数据库：
Apache CouchDB 是一个开源的面向文档的 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 存储数据，使用 MapReduce 作为其查询语言的 JavaScript，以及用于 API 的 HTTP。它由 Apache 软件基金会开发，最初于 2005 年发布。它是用 Erlang 编写的。
SQLite 和 CouchDB 的区别：
| S.NO. | SQLITE | COUCHDB |
|---|---|---|
| 1. | Developed By D. Richard Hipp on August 2000. | Developed by Apache Software Foundation and initially released in 2005. |
| 2. | SQLite is developed only in C language. | CouchDB is written in Erlang. |
| 3. | It is widely used in-process RDBMS. | A native JSON – document store inspired by Lotus Notes, scalable from globally distributed server-clusters down to mobile phones. |
| 4. | The primary database model for SQLite is Relational DBMS. | The primary database model for CouchDB is Document Store. |
| 5. | SQLite does not require a server to run. Hence, it is serverless. | Server operating systems for CouchDB are Android, BSD, Linux, OS X, Solaris and Windows. |
| 6. | In SQLite, Data Schema is fixed. | CouchDB is Data Schema free. |
| 7. | SQLite have predefined datatypes such as float, date, number, etc. | In CouchDB there is no predefined datatypes. |
| 8. | It does not supports XML format. | It does not supports XML format. |
| 9. | It does not support any replication methods. | It support two replication methods –
|
| 10. | SQLite provides ACID transactions. | CouchDB does not supports ACID transactions. |
| 11. | SQLite does not supports Map Reduce method. | CouchDB supports Map Reduce method. |
| 12. | SQLite provides the concept of Referential Integrity and have Foreign keys. | CouchDB does not provides the concept of Referential Integrity. Hence, no Foreign Keys. |