📅 最后修改于: 2020-11-12 00:31:22 🧑 作者: Mango
当今行业中使用了许多数据库。有些是SQL数据库，有些是NoSQL数据库。常规数据库是使用表格关系模型表示数据及其关系的SQL数据库系统。 NoSQL数据库是一种较新的数据库，它提供了一种用于存储和检索数据的机制，而不是关系数据库中使用的表格关系模型。
以下是SQL和NoSQL数据库之间的差异列表：
| Index | SQL | NoSQL |
|---|---|---|
| 1) | Databases are categorized as Relational Database Management System (RDBMS). | NoSQL databases are categorized as Non-relational or distributed database system. |
| 2) | SQL databases have fixed or static or predefined schema. | NoSQL databases have dynamic schema. |
| 3) | SQL databases display data in form of tables so it is known as table-based database. | NoSQL databases display data as collection of key-value pair, documents, graph databases or wide-column stores. |
| 4) | SQL databases are vertically scalable. | NoSQL databases are horizontally scalable. |
| 5) | SQL databases use a powerful language “Structured Query Language” to define and manipulate the data. | In NoSQL databases, collection of documents are used to query the data. It is also called unstructured query language. It varies from database to database. |
| 6) | SQL databases are best suited for complex queries. | NoSQL databases are not so good for complex queries because these are not as powerful as SQL queries. |
| 7) | SQL databases are not best suited for hierarchical data storage. | NoSQL databases are best suited for hierarchical data storage. |
| 8) | MySQL, Oracle, Sqlite, PostgreSQL and MS-SQL etc. are the example of SQL database. | MongoDB, BigTable, Redis, RavenDB, Cassandra, Hbase, Neo4j, CouchDB etc. are the example of nosql database |