> For the complete documentation index, see [llms.txt](https://api-docs.rightsline.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://api-docs.rightsline.com/search/search-functions/join-functions.md).

# Join functions

| Function                                                                         | Description                                       |
| -------------------------------------------------------------------------------- | ------------------------------------------------- |
| [$join\_parent\_rel](/search/search-functions/join-functions/join_parent_rel.md) | Match query against related parent relationships. |
| [$join\_child\_rel](/search/search-functions/join-functions/join_child_rel.md)   | Match query against related child relationships.  |
| [$join](/search/search-functions/join-functions/join.md)                         | Join any query to another query.                  |