USE test; DROP TABLE IF EXISTS fact_cpc_clicks; DROP TABLE IF EXISTS dim_model; CREATE TABLE fact_cpc_clicks (model_id UInt8) ENGINE = Memory; CREATE TABLE dim_model (model_id UInt8) ENGINE = Memory; INSERT INTO fact_cpc_clicks VALUES (1); INSERT INTO dim_model VALUES (1); select f.model_id from fact_cpc_clicks as f left join dim_model as d on f.model_id=d.model_id limit 10; USE default; select f.model_id from test.fact_cpc_clicks as f left join test.dim_model as d on f.model_id=d.model_id limit 10; DROP TABLE test.fact_cpc_clicks; DROP TABLE test.dim_model;