# SQL

![](https://static.scarf.sh/a.png?x-pxid=6bd80893-c66f-4950-9e6d-c21358e9e8c9)

The *SQL* processor lets you use conditional expressions to select content from logs. This processor doesn't depend on a database or table. Instead, your queries run on the stream.

This processor differs from the stream processor interface that runs after filters.

{% hint style="info" %}
Only [YAML configuration files](https://docs.fluentbit.io/manual/4.0/administration/configuring-fluent-bit/yaml) support processors.
{% endhint %}

## Configuration parameters

| Key     | Description                                                                    |
| ------- | ------------------------------------------------------------------------------ |
| `query` | The SQL statement to query your logs stream. This statement must end with `;`. |

## Basic selection example

The following example generates a sample message with the keys `key` and `http.url`, and then uses a SQL statement to select only the key `http.url`.

{% tabs %}
{% tab title="fluent-bit.yaml" %}

```yaml
pipeline:
  inputs:
    - name: dummy
      dummy: '{"key1": "123.4", "http.url": "https://fluentbit.io/search?q=docs"}'

      processors:
        logs:
          - name: sql
            query: "SELECT http.url FROM STREAM;"

  outputs:
    - name : stdout
      match: '*'
      format: json_lines
```

{% endtab %}
{% endtabs %}

## Extract and select example

The following example is similar to the previous example, but additionally extracts part of `http.url` to select the domain from the value. To accomplish this, use the `content-modifier` and `sql` processors in tandem:

{% tabs %}
{% tab title="fluent-bit.yaml" %}

```yaml
pipeline:
  inputs:
    - name: dummy
      dummy: '{"key1": "123.4", "http.url": "https://fluentbit.io/search?q=docs"}'

      processors:
        logs:
          - name: content_modifier
            action: extract
            key: "http.url"
            pattern: ^(?<http_protocol>https?):\/\/(?<http_domain>[^\/\?]+)(?<http_path>\/[^?]*)?(?:\?(?<http_query_params>.*))?

    - name: sql
      query: "SELECT http_domain FROM STREAM;"

  outputs:
    - name : stdout
      match: '*'
      format: json_lines
```

{% endtab %}
{% endtabs %}

The resulting output resembles the following:

```json
{
  "date": 1711059261.630668,
  "http_domain": "fluentbit.io"
}
```


---

# Agent Instructions: 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:

```
GET https://docs.fluentbit.io/manual/4.0/data-pipeline/processors/sql.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
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.