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23 lines
403 B
MySQL
23 lines
403 B
MySQL
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SELECT key2, arrayReduce('uniqExactMerge', arr)
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FROM
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(
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SELECT
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key1 % 3 AS key2,
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groupArray(state) AS arr
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FROM
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(
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SELECT
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number % 10 AS key1,
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uniqExactState(number) AS state
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FROM
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(
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SELECT *
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FROM system.numbers
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LIMIT 100
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)
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GROUP BY key1
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)
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GROUP BY key2
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)
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ORDER BY key2;
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