Example image of eyePlorer eyePlorer map for 'PostgreSQL': Object-relational database BSD licenses Free and open source software Open source SQL Ingres (database) University of California, Berkeley Michael Stonebraker QUEL query languages Internet Illustra Red Hat Btrieve Novell NetWare Pervasive Software EnterpriseDB Oracle Database Business intelligence Data warehouse Greenplum Original equipment manufacturer Sun Microsystems Vice president Control flow Iteration PostgreSQL Perl C (programming language) C++ R (programming language) Stored procedure B+ tree GiST Hash table Expression index Partial index Bitmap index Data Manipulation Language Insert (SQL) Update (SQL) Database trigger View (database) Concurrency control Multiversion concurrency control ACID Data type XML XPath Geographic information system PostGIS