ClickHouse/dbms/tests/queries/0_stateless/01000_subquery_requires_alias.sql

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SET joined_subquery_requires_alias = 1;
SELECT * FROM (SELECT 1 as A, 2 as B) X
ALL LEFT JOIN (SELECT 3 as A, 2 as B) Y
USING (B);
SELECT * FROM (SELECT 1 as A, 2 as B) X
ALL LEFT JOIN (SELECT 3 as A, 2 as B)
USING (B); -- { serverError 206 }
SELECT * FROM (SELECT 1 as A, 2 as B)
ALL LEFT JOIN (SELECT 3 as A, 2 as B) Y
USING (B); -- { serverError 206 }
set joined_subquery_requires_alias = 0;
SELECT * FROM (SELECT 1 as A, 2 as B)
ALL LEFT JOIN (SELECT 3 as A, 2 as B) Y
USING (B);