Difference between PostgreSQL and Amazon CloudSearch

1. PostgreSQL : PostgreSQL is a powerful, open-source Object-relational database system. It provides good performance with low maintenance efforts because of its high stability. PostgreSQL was the first DBMS that implemented multi-version concurrency control (MVCC) feature. 2. Amazon CloudSearch : It is a scalable cloud-based search service that forms part of Amazon Web Services. It is a hosted search engine service by Amazon with the data stored in the Amazon cloud. This Database supports 34 languages and its features are as follows highlighting, autocomplete, and geospatial search. 
Difference between PostgreSQL and Amazon CloudSearch :

S.No.	PostgreSQL	Amazon CloudSearch
1.	It is developed By PostgreSQL Global Development Group on 1989.	It is developed By Amazon in 2012.
2.	It is Open Source.	It is commercial.
3.	Server operating systems for PostgreSQL is FreeBSD, HP-UX, Linux, NetBSD, OpenBSD, OS X, Solaris, Unix, Windows.	Server operating systems for Amazon CloudSearch is hosted.
4.	Its Primary database model is a Relational DBMS.	Its primary database model is a Search engine.
5.	It has predefined data type such as date or float.	It also has  no predefined data type such as date or float.
6.	It supports SQL.	It does not support SQL.
7.	APIs and other access methods for PostgreSQL is ADO.NET, JDBC, native C library, ODBC, streaming API for large objects.	APIs and other access methods for Amazon CloudSearch is HTTP API.
8.	It supports ACID properties.	It does not support ACID properties.
9.	It supports Server-side scripting using user defined functions.	It does not support Server-side scripting.
10.	It supports Triggers.	It does not support Triggers.
11.	It supports Partitioning methods using partitioning by range, list and (since PostgreSQL 11) by hash.	It also supports Partitioning methods.
12.	It provides the concept of Referential Integrity. Hence, there is Foreign Keys.	It does not provides the concept of Referential Integrity. Hence, there is no Foreign Keys.