1. |
It is developed By PostgreSQL Global Development Group on 1989. |
It is developed By Amazon in 2007. |
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 SimpleDB is hosted. |
4. |
Its Primary database model is a Relational DBMS. |
Its primary database model is the Key-value store. |
5. |
It has predefined data type such as date or float. |
It 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 SimpleDB is RESTful HTTP API. |
8. |
Programming languages supported by PostgreSQL are .Net, C, C++, Delphi, Java, JavaScript (Node.js), Perl, PHP, Python, Tcl. |
Programming languages supported by Amazon SimpleDB are .Net, C, C++, Erlang, Java, PHP, Python, Ruby, Scala. |
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 does not support Partitioning methods. |
12. |
It provides the concept of Referential Integrity. Hence, there is Foreign Keys. |
It does not provide the concept of Referential Integrity. Hence, there is no Foreign Keys. |
13. |
It supports ACID properties. |
It does not support ACID properties. |