# SQL Reference for ksqlDB on Confluent Platform

This reference covers the ksqlDB SQL language: data definition, data
types, keywords and operators, lexical structure, and time units.

- [Data Definition](data-definition.md#ksqldb-data-definition): Create the structures that
  store your events.
- [Data Types](data-types.md#ksqldb-reference-data-types): Available logical types for
  declaring the input and output types of your operations.
- [SQL Keywords and Operators](keywords-and-operators.md#ksqldb-keywords-and-operators): All of the
  language keywords and operators you can use in your SQL expressions.
- [Syntax and Lexical Structure](lexical-structure.md#ksqldb-lexical-structure): Overview of
  the ksqlDB language syntax.
- [Time Units and Formats](time.md#ksqldb-reference-time-units-and-formats):
  Keywords that express time in your SQL expressions.