GDBase understands most of the standard SQL language. However, it omits some features while at the same time adding a few features of its own. This document attempts to describe precisely what parts of the SQL language GDBase does or does not support.

In all of the syntax diagrams that follow, literal text is shown in bold. Non-terminal symbols are shown in italic. Operators that are part of the syntactic markup itself are shown in black roman.

GDBase supports the following commands:

Details on the implementation of each command are provided in the sections below.

A unique feature of GDBase is its ability to use Gython code to process data. This functionality is described in the CREATE TABLE ... TRANSFORM section of this chapter.

The construction of expressions used in queries and other operations is described in the Expressions section.

The built-in string, numeric, date and time, and aggregate functions are described in the Core Functions section.