37 lines
964 B
SQL
37 lines
964 B
SQL
DROP TEMPORARY TABLE IF EXISTS tData;
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CREATE TEMPORARY TABLE tData
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ENGINE = MEMORY
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SELECT 1 `group`, 1 `max`, 10 `value`
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UNION SELECT 1, 3, 30
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UNION SELECT 1, 2, 20
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UNION SELECT 1, 3, 31
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UNION SELECT 1, 2, 21
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UNION SELECT 2, '4', 40
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UNION SELECT 2, '6', 60
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UNION SELECT 2, '5', 50
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UNION SELECT 2, '6', 61
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UNION SELECT 2, '5', 51
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UNION SELECT 3, 7, 70
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UNION SELECT 3, 9, 90
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UNION SELECT 3, 8, 80
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UNION SELECT 3, 9, NULL
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UNION SELECT 3, 8, 81
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UNION SELECT 4, NULL, 101
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UNION SELECT 4, NULL, 102;
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DROP TEMPORARY TABLE IF EXISTS tExpect;
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CREATE TEMPORARY TABLE tExpect
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ENGINE = MEMORY
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SELECT 1 `group`, 31 expect
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UNION SELECT 2, 61
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UNION SELECT 3, NULL
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UNION SELECT 4, 102;
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SELECT e.`group`, r.result, e.expect, r.result <=> e.expect isRight
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FROM tExpect e
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LEFT JOIN (
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SELECT `group`, multimax(`max`, `value`) result
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FROM tData GROUP BY `group`
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) r ON r.`group` = e.`group`;
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DROP TEMPORARY TABLE tData, tExpect; |