-- Tags: shard DROP TABLE IF EXISTS limit_by; CREATE TABLE limit_by (Num UInt32, Name String) ENGINE = Memory; INSERT INTO limit_by (Num, Name) VALUES (1, 'John'); INSERT INTO limit_by (Num, Name) VALUES (1, 'John'); INSERT INTO limit_by (Num, Name) VALUES (3, 'Mary'); INSERT INTO limit_by (Num, Name) VALUES (3, 'Mary'); INSERT INTO limit_by (Num, Name) VALUES (3, 'Mary'); INSERT INTO limit_by (Num, Name) VALUES (4, 'Mary'); INSERT INTO limit_by (Num, Name) VALUES (4, 'Mary'); INSERT INTO limit_by (Num, Name) VALUES (5, 'Bill'); INSERT INTO limit_by (Num, Name) VALUES (7, 'Bill'); INSERT INTO limit_by (Num, Name) VALUES (7, 'Bill'); INSERT INTO limit_by (Num, Name) VALUES (7, 'Mary'); INSERT INTO limit_by (Num, Name) VALUES (7, 'John'); -- Two elemens in each group SELECT Num FROM limit_by ORDER BY Num LIMIT 2 BY Num; -- LIMIT BY doesn't affect result of GROUP BY SELECT Num, count(*) FROM limit_by GROUP BY Num ORDER BY Num LIMIT 2 BY Num; -- LIMIT BY can be combined with LIMIT SELECT Num, Name FROM limit_by ORDER BY Num LIMIT 1 BY Num, Name LIMIT 3; -- Distributed LIMIT BY SELECT dummy FROM remote('127.0.0.{2,3}', system.one) LIMIT 1 BY dummy; SELECT dummy FROM remote('127.0.0.{2,3}', system.one) LIMIT 2 BY dummy; SELECT 1 as one FROM remote('127.0.0.{2,3}', system.one) LIMIT 1 BY one; -- Distributed LIMIT BY with LIMIT SELECT toInt8(number / 5 + 100) AS x FROM remote('127.0.0.1', system.numbers) LIMIT 2 BY x LIMIT 5; -- Distributed LIMIT BY with ORDER BY non-selected column SELECT 1 AS x FROM remote('127.0.0.{2,3}', system.one) ORDER BY dummy LIMIT 1 BY x; DROP TABLE IF EXISTS limit_by;