# StarRocks Documentation — Sql Reference

> Section index of the StarRocks documentation. For the complete documentation index, see [llms.txt](https://docs.starrocks.io/llms.txt). Pages are available as Markdown at their `.md` URLs.

## Sql Reference

### Sql Reference

- [AWS IAM policies](https://docs.starrocks.io/docs/sql-reference/aws_iam_policies.md): A policy in AWS IAM declares a set of permissions on a specific AWS resource.
- [Error Codes](https://docs.starrocks.io/docs/sql-reference/Error_code.md): Reference for common StarRocks error codes returned for query requests.
- [HTTP SQL API](https://docs.starrocks.io/docs/sql-reference/http_sql_api.md): StarRocks v3.2.0 introduces the HTTP SQL API for users to perform various types of queries using HTTP.
- [Information Schema](https://docs.starrocks.io/docs/sql-reference/information_schema.md): The StarRocks Information Schema is a database within each StarRocks instance.
- [SQL statements](https://docs.starrocks.io/docs/sql-reference/sql-statements.md)
- [System metadatabase](https://docs.starrocks.io/docs/sql-reference/sys.md): Each StarRocks cluster maintains a database sys, which contains several read-only, system-defined views.
- [System limits](https://docs.starrocks.io/docs/sql-reference/System_limit.md): System limits and naming rules for StarRocks objects including databases, tables, partitions, columns, and identifiers.
- [System variables](https://docs.starrocks.io/docs/sql-reference/System_variable.md): StarRocks provides many system variables that can be set and modified to suit your requirements.
- [User-defined variables](https://docs.starrocks.io/docs/sql-reference/user_defined_variables.md): StarRocks 2.5 and later versions support user-defined variables.

- [Data Types](https://docs.starrocks.io/docs/sql-reference/data-types/llms.txt): 26 documentation pages.
- [Information Schema](https://docs.starrocks.io/docs/sql-reference/information_schema/llms.txt): 52 documentation pages.
- [Sql Functions](https://docs.starrocks.io/docs/sql-reference/sql-functions/llms.txt): 467 documentation pages.
- [Sql Statements](https://docs.starrocks.io/docs/sql-reference/sql-statements/llms.txt): 217 documentation pages.
- [Sys](https://docs.starrocks.io/docs/sql-reference/sys/llms.txt): 6 documentation pages.