Percona Distribution for PostgreSQL vs. PostgreSQL vs. Unlambda vs. dbForge Query Builder for SQL Server Comparison Chart

Percona Distribution for PostgreSQL is a single source which provides an enterprise-grade, open source installation of PostgreSQL Core Distribution, plus critical additional enterprise components. PostgreSQL Core Distribution is an ACID-compliant relational database management system, supporting a wide range of data types and user-defined objects. A stable and secure open source product, PostgreSQL Core Distribution is relied upon by multiple organizations. You no longer need to find solutions for common requirements, like high availability and backup, on your own. When you install Percona Distribution for PostgreSQL, you get everything you need to be up and running with PostgreSQL, including PostgreSQL Core Distribution, pg_repack, pgaudit, pgBackRest, and Patroni. Percona Distribution for PostgreSQL delivers all of this in a single installation. The components are tested to work together and, along with the PostgreSQL Core Distribution, they are updated as required.

Unlambda is a programming language. Nothing remarkable there. The originality of Unlambda is that it stands as the unexpected intersection of two marginal families of languages. Functional programming languages, of which the canonical representative is Scheme (a Lisp dialect). This means that the basic object manipulated by the language (and indeed the only one as far as Unlambda is concerned) is the function. Rather, Unlambda uses a functional approach to programming: the only form of objects it manipulates are functions. Each function takes a function as an argument and returns a function. Apart from a binary “apply” operation, Unlambda provides several built-in functions (the most important ones being the K and S combinators). User-defined functions can be created, but not saved or named, because Unlambda does not have any variables.