LEFT SEMI JOIN and RIGHT SEMI JOIN, a whitelist on “join keys”, without producing a cartesian product.Alternative syntax for CROSS JOIN is specifying multiple tables in FROM clause separated by commas.Īdditional join types available in ClickHouse: JOIN without specified type implies INNER. CROSS JOIN, produces cartesian product of whole tables, “join keys” are not specified.FULL OUTER JOIN, non-matching rows from both tables are returned in addition to matching rows.RIGHT OUTER JOIN, non-matching rows from right table are returned in addition to matching rows.LEFT OUTER JOIN, non-matching rows from left table are returned in addition to matching rows.INNER JOIN, only matching rows are returned.Supported Types of JOIN Īll standard SQL JOIN types are supported: ![]() Unless otherwise stated, join produces a Cartesian product from rows with matching “join keys”, which might produce results with much more rows than the source tables. Expressions from ON clause and columns from USING clause are called “join keys”.
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