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7 lines
447 B
MySQL
7 lines
447 B
MySQL
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DROP TABLE IF EXISTS test.arena;
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CREATE TABLE test.arena (k UInt8, d String) ENGINE = Memory;
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INSERT INTO test.arena SELECT number % 10 AS k, hex(intDiv(number, 10) % 1000) AS d FROM system.numbers LIMIT 10000000;
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SELECT length(groupUniqArrayIf(d, d != hex(0))) FROM test.arena GROUP BY k;
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SELECT length(groupUniqArrayMerge(ds)) FROM (SELECT k, groupUniqArrayState(d) AS ds FROM test.arena GROUP BY k) GROUP BY k;
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DROP TABLE IF EXISTS test.arena;
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