> For the complete documentation index, see [llms.txt](https://hunter-ducharme.gitbook.io/sql-basics/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hunter-ducharme.gitbook.io/sql-basics/basic_syntax.md).

# Basic Syntax

\ <br>

### What is Structured Query Language?

Structured Query Language, or SQL, is a special-purpose programming language used to manage data within a relational database management system (RDBMS).

You will find that there are multiple ways to write the same query in SQL, and some ways are better than others.

<br>

### Two Parts of SQL

**Data Definition Language (DDL):** DDL includes commands to create a table, to drop a table, or create and drop other aspects of a database.

**Data Manipulation Language (DML):** DML includes commands that are used to query and modify a database. It includes the select statement for querying the database, and the insert, update, and delete statements, all for modifying the database.


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://hunter-ducharme.gitbook.io/sql-basics/basic_syntax.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.