Simple Join Query loop 30000 6000 60000 CREATE TABLE join_table(A Int64, S0 String, S1 String, S2 String, S3 String)ENGINE = MergeTree ORDER BY A INSERT INTO join_table SELECT number AS A, toString(arrayMap(x->x, range(100))) S0, S0 AS S1, S0 AS S2, S0 AS S3 from numbers(500000) SELECT COUNT() FROM join_table LEFT JOIN join_table USING A SELECT COUNT() FROM join_table LEFT JOIN (SELECT A FROM join_table) USING A SELECT COUNT() FROM join_table AS left LEFT JOIN join_table AS right ON left.A = right.A SELECT COUNT() FROM join_table AS left LEFT JOIN (SELECT A FROM join_table) AS right ON left.A = right.A DROP TABLE IF EXISTS join_table