This is a list of terms and their meaning in the context of PostgreSQL and relational database systems in general.

The SQL standard defines four levels of transaction isolation. The most strict is Serializable, which is defined by the standard in a paragraph which says that any concurrent execution of a set of ...

ALTER ROLE changes the attributes of a PostgreSQL role. The first variant of this command listed in the synopsis can change many of the role attributes that can be specified in CREATE ROLE. (All the ...

and then immediately issue SQL commands to test the function. Another good way to develop in PL/pgSQL is with a GUI database access tool that facilitates development in a procedural language. One ...

All parameter names are case-insensitive. Every parameter takes a value of one of five types: boolean, string, integer, floating point, or enumerated (enum). The type determines the syntax for setting ...