# SQL language reference

Derby implements an SQL-92 core subset, as well as some SQL-99 features.

This section provides an overview of the current SQL language by describing the statements, built-in functions, data types, expressions, and special characters it contains.

- Capitalization and special characters
- SQL identifiers
- Statements
- Built-in functions
- Built-in system functions
- Built-in system procedures
- Data types
- SQL expressions