> For the complete documentation index, see [llms.txt](https://cortex-docs.paloaltonetworks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cortex-docs.paloaltonetworks.com/xql-command-reference-guide/readme/functions/min_with_windowcomp_stage.md). # min (windowcomp) Use the `min()` function within the `windowcomp` stage to compute the minimum value of a specified field over a window of rows. Unlike the `comp` stage version, the `windowcomp` version preserves all original rows and adds the computed minimum as a new field. This is equivalent to `MIN() OVER(...)` in SQL. ## Syntax ```sql | windowcomp min() [by , , ...] [sort [asc|desc] , ...] [between [and ] [frame_type=rows|range]] [as ] ``` ## Parameters | Name | Type | Required | Description | | ----------------- | ---------------------------- | -------- | --------------------------------------------------------------------------------------------------------------------- | | `field` | numeric, string, or datetime | Yes | The field from which to compute the minimum value. | | `partition_field` | any | No | One or more fields to partition the data by (equivalent to SQL `PARTITION BY`). | | `sort_field` | any | No | One or more fields to define the order within each partition (equivalent to SQL `ORDER BY`). Defaults to ascending. | | `lower` | integer or `null` | No | Lower bound of the window frame. `0` = current row, negative = rows before, `null` = unbounded. | | `upper` | integer or `null` | No | Upper bound of the window frame. `0` = current row, positive = rows after, `null` = unbounded. | | `frame_type` | `rows` or `range` | No | Type of window frame. `rows` (default) uses physical row offsets; `range` uses value-based offsets on the sort field. | | `alias` | string | No | An alias for the output field. | ## Returns **Type**: same as input field **Description**: The `min()` function returns the minimum value within the defined window for each row. All original rows are preserved. ## Usage notes * **Row preservation**: Unlike `comp min()`, the `windowcomp min()` does not reduce the number of rows. Each row retains its original data and gets an additional field with the window minimum. * **No partitioning**: If no `by` clause is specified, the window spans the entire result set. * **Default frame**: If no window frame is specified, the default frame is from the start of the partition to the current row (`between null and 0`). * **Null handling**: NULL values are ignored in the computation. * **Running minimum**: Can be combined with `sort` to compute running minimums. ## Examples ### Example 1: Minimum severity per host (all rows preserved) **Goal**: Compute the minimum alert severity for each host while preserving all original rows. **XQL code**: ```sql dataset = xdr_data | windowcomp min(alert_severity) by agent_hostname as min_severity_per_host ``` **Explanation**: The `min()` function computes the minimum `alert_severity` within each `agent_hostname` partition. All original rows are preserved, and each row receives the partition's minimum value in `min_severity_per_host`. **Output**: | \_TIME | AGENT\_HOSTNAME | ALERT\_SEVERITY | MIN\_SEVERITY\_PER\_HOST | | ------------------- | --------------- | --------------- | ------------------------ | | 2024-01-15 08:00:00 | workstation-1 | 3 | 3 | | 2024-01-15 09:00:00 | workstation-1 | 7 | 3 | | 2024-01-15 10:00:00 | workstation-1 | 5 | 3 | | 2024-01-15 08:30:00 | workstation-2 | 2 | 2 | | 2024-01-15 09:30:00 | workstation-2 | 4 | 2 | ### Example 2: Running minimum over time **Goal**: Compute a running minimum of bytes received, ordered by time. **XQL code**: ```sql dataset = xdr_data | windowcomp min(action_network_bytes_received) sort asc _time as running_min_bytes ``` **Explanation**: By sorting on `_time` in ascending order, the `min()` function computes a running minimum of `action_network_bytes_received` from the start of the dataset up to the current row. **Output**: | \_TIME | ACTION\_NETWORK\_BYTES\_RECEIVED | RUNNING\_MIN\_BYTES | | ------------------- | -------------------------------- | ------------------- | | 2024-01-15 08:00:00 | 500 | 500 | | 2024-01-15 09:00:00 | 250 | 250 | | 2024-01-15 10:00:00 | 400 | 250 | | 2024-01-15 11:00:00 | 100 | 100 | ### Example 3: Minimum within a sliding window of 3 rows **Goal**: Compute the minimum bytes received within a sliding window of 3 rows (current row plus one row before and one row after). **XQL code**: ```sql dataset = xdr_data | windowcomp min(action_network_bytes_received) sort asc _time between -1 and 1 as local_min ``` **Explanation**: The `between -1 and 1` clause defines a sliding window of 3 rows centered on the current row. The `min()` function returns the minimum `action_network_bytes_received` value within that window for each row. **Output**: | \_TIME | ACTION\_NETWORK\_BYTES\_RECEIVED | LOCAL\_MIN | | ------------------- | -------------------------------- | ---------- | | 2024-01-15 08:00:00 | 500 | 250 | | 2024-01-15 09:00:00 | 250 | 250 | | 2024-01-15 10:00:00 | 400 | 100 | | 2024-01-15 11:00:00 | 100 | 100 | ## Related articles * **Stages**: [`windowcomp`](/xql-command-reference-guide/readme/stages/windowcomp.md), [`comp`](/xql-command-reference-guide/readme/stages/comp.md), [`sort`](/xql-command-reference-guide/readme/stages/sort.md) * **Functions**: [`min (comp)`](/xql-command-reference-guide/readme/functions/min_with_comp_stage.md), [`max()`](/xql-command-reference-guide/readme/functions/max_with_windowcomp_stage.md), [`least()`](/xql-command-reference-guide/readme/functions/least.md) * **Datasets**: [`xdr_data`](https://docs-cortex.paloaltonetworks.com/r/Cortex-XQL-Schema-Reference-Guide/Introduction) --- # 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://cortex-docs.paloaltonetworks.com/xql-command-reference-guide/readme/functions/min_with_windowcomp_stage.md?ask=&goal= ``` `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.