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> **Documentation Index:** Fetch the complete configuration index at https://ydb.tech/docs/en/llms.txt

# YQL - Overview

*YQL* (YDB Query Language) is a universal declarative query language for YDB, a dialect of SQL. YQL has been natively designed for large distributed databases, and therefore has a number of differences from the SQL standard.

YDB tools support interfaces for sending YQL queries and receiving their execution results:



- [YDB CLI](https://ydb.tech/docs/en/reference/ydb-cli/index.md)
- [YDB SDK](https://ydb.tech/docs/en/reference/ydb-sdk/index.md)

This documentation section contains the YQL reference that includes the sections:

- [Data types](https://ydb.tech/docs/en/yql/reference/types/index.md) with a description of data types used in YQL
- [Syntax](syntax/) with a full list of YQL commands
- [Built-in functions](https://ydb.tech/docs/en/yql/reference/builtins/index.md) with a description of the available built-in functions

You can also take a tutorial to get familiar with the basic YQL commands, in the [YQL tutorial](https://ydb.tech/docs/en/dev/yql-tutorial/index.md) section.