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Sync from docs: document composite-key JOIN support in Sync Streams (powersync-docs #395) #39

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michaelbarnes merged 1 commit into from
Jun 4, 2026
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Sync from docs: document composite-key JOIN support in Sync Streams (powersync-docs #395) #39

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15 changes: 14 additions & 1 deletion skills/powersync/references/sync-config.md
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Expand Up @@ -218,6 +218,19 @@ streams:
WHERE tm.user_id = auth.user_id()
```

For composite-key joins (multiple join columns), use implicit join syntax with multiple `WHERE` equality conditions:

```yaml
streams:
regional_comments:
query: |
SELECT comments.*
FROM comments, issues
WHERE comments.issue_id = issues.id
AND comments.region = issues.region
AND issues.user_id = auth.user_id()
```

### Subquery

Use `WHERE id IN (SELECT ...)` for indirect access through a related table:
Expand Down Expand Up @@ -397,7 +410,7 @@ There are examples available for each PowerSync Client SDK.
### Frameworks

| Framework | Client Usage Reference URL |
|---------------------------|--------------------------------------------------------------------------------------------------------------------|
|---------------------------|-----------------------------------------------------------------------------------------------------------------|
| React | [Client Usage](https://docs.powersync.com/sync/streams/client-usage.md#react-hooks) |

## Advanced Topics
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