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docs: state limitations of USING clause.

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State that it is (currently) not possible to use `USING` with multiple joins. The exception thrown is `Multiple USING statements are not supported`. The relevant code section is d08ce13107/src/Interpreters/CrossToInnerJoinVisitor.cpp (L191-L192).
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Joris Clement 2023-10-23 09:41:24 +02:00 committed by GitHub
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docs/en/sql-reference/statements/select/join.md
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@ -334,6 +334,7 @@ For multiple `JOIN` clauses in a single `SELECT` query:
- Taking all the columns via `*` is available only if tables are joined, not subqueries.
- The `PREWHERE` clause is not available.
- The `USING` clause is not available.
For `ON`, `WHERE`, and `GROUP BY` clauses: