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Document multi-column join conditions in Sync Streams #395

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Document multi-column join conditions in Sync Streams #395

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Document multi-column join conditions in Sync Streams
mintlify[bot] Apr 17, 2026
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Improve composite key example
benitav Apr 22, 2026
194f542
Merge branch 'main' into mintlify/multi-column-joins-1776464036
benitav Apr 22, 2026
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6 changes: 6 additions & 0 deletions sync/supported-sql.mdx
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Expand Up @@ -270,6 +270,12 @@ Sync Streams support a subset of join syntax. The following rules define what is
-- Valid: columns from one table
SELECT comments.* FROM comments INNER JOIN issues ON comments.issue_id = issues.id

-- Valid: multiple equality conditions (composite keys)
SELECT comments.* FROM comments, issues
WHERE comments.issue_id = issues.id
AND comments.region = issues.region
AND issues.user_id = auth.user_id()

-- Invalid: columns from multiple tables
SELECT comments.*, issues.title FROM comments JOIN issues ON comments.issue_id = issues.id

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