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