drop table if exists t1_00816; drop table if exists t2_00816; create table t1_00816 (a Int8, val Float32) engine=Memory(); create table t2_00816 (a Int8, val Float32) engine=Memory(); INSERT INTO t1_00816 VALUES (1, 123); INSERT INTO t2_00816 VALUES (1, 456); select t1_00816.a, t2_00816.a from t1_00816 all inner join t2_00816 on t1_00816.a=t2_00816.a; -- Received exception from server (version 18.14.1): -- Code: 47. DB::Exception: Received from localhost:9000, 127.0.0.1. DB::Exception: Unknown identifier: t2_00816.a. -- this query works fine select t1_00816.a, t2_00816.* from t1_00816 all inner join t2_00816 on t1_00816.a=t2_00816.a; -- and this select t1_00816.a, t2_00816.val from t1_00816 all inner join t2_00816 on t1_00816.a=t2_00816.a; DROP TABLE t1_00816; DROP TABLE t2_00816;