# AQL command categories

AQL commands essentially break down into these categories:

| Category | Commands |
| --- | --- |
| Output-producing | sort command list command |
| List-producing | nselect command sselect command nselect command |
| Statistical | count command check-sum command istat command check-sum command |
| Tape-handling | t-dump command s-dump command t-load command |
| File-analysis | hash-test command istat command |
| Internal (or copy) format | list-item command (Access Query Language) sort-item command |
| Label-like-producing | list-label command sort-label command |
| File-updating | reformat command sreformat command |

## See also

- [Access Query Language](https://d3codex.com/access/access-query-language/)
- [Conversion](https://d3codex.com/definitions/conversion/)
- [Dictionaries](https://d3codex.com/definitions/dictionaries/)
- [File reference (Access Query Language)](https://d3codex.com/access/file-reference-access-query-language/)
- [Item list](https://d3codex.com/access/item-list/)
- [Modifiers](https://d3codex.com/access/modifiers/)
- [only modifier](https://d3codex.com/access/only-modifier/)
- [Options (Access Query Language)](https://d3codex.com/access/options-access-query-language/)
- [sampling modifier](https://d3codex.com/access/sampling-modifier/)
- [Selection criteria](https://d3codex.com/access/selection-criteria/)
- [Selection processor](https://d3codex.com/definitions/selection-processor/)

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Source: https://d3codex.com/access/aql-command-categories/ - part of the D3Codex reference.