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PostgreSQL: The worlds most advanced open source database PostgreSQL is a powerful, open source object-relational database system with over 35 years of active development that has earned it a strong reputation for reliability, feature robustness, and performance
Downloads - PostgreSQL PostgreSQL is available for download as ready-to-use packages or installers for various platforms, as well as a source code archive if you want to build it yourself
Windows installers - PostgreSQL StackBuilder, a package manager for downloading and installing additional PostgreSQL tools and drivers Stackbuilder includes management, integration, migration, replication, geospatial, connectors and other tools
PostgreSQL 17 Released! PostgreSQL 17 builds on decades of open source development, improving its performance and scalability while adapting to emergent data access and storage patterns
PostgreSQL wiki Welcome to the PostgreSQL Wiki! This wiki contains user documentation, how-tos, and tips 'n' tricks related to PostgreSQL It also serves as a collaboration area for PostgreSQL contributors
PostgreSQL: Documentation: 18: Part I. Tutorial The tutorial is intended to give an introduction to PostgreSQL, relational database concepts, and the SQL language We assume some general knowledge about how to use computers and no particular Unix or programming experience is required
9. 2. Comparison Functions and Operators - PostgreSQL If it is enabled, PostgreSQL will convert x = NULL clauses to x IS NULL If the expression is row-valued, then IS NULL is true when the row expression itself is null or when all the row's fields are null, while IS NOT NULL is true when the row expression itself is non-null and all the row's fields are non-null