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General Tech Bugs & Fixes 2 years ago
Posted on 16 Aug 2022, this text provides information on Bugs & Fixes related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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My table is:
id home datetime player resource ---|-----|------------|--------|--------- 1 | 10 | 04/03/2009 | john | 399 2 | 11 | 04/03/2009 | juliet | 244 5 | 12 | 04/03/2009 | borat | 555 3 | 10 | 03/03/2009 | john | 300 4 | 11 | 03/03/2009 | juliet | 200 6 | 12 | 03/03/2009 | borat | 500 7 | 13 | 24/12/2008 | borat | 600 8 | 13 | 01/01/2009 | borat | 700
I need to select each distinct home holding the maximum value of datetime.
home
datetime
Result would be:
id home datetime player resource ---|-----|------------|--------|--------- 1 | 10 | 04/03/2009 | john | 399 2 | 11 | 04/03/2009 | juliet | 244 5 | 12 | 04/03/2009 | borat | 555 8 | 13 | 01/01/2009 | borat | 700
I have tried:
-- 1 ..by the MySQL manual: SELECT DISTINCT home, id, datetime AS dt, player, resource FROM topten t1 WHERE datetime = (SELECT MAX(t2.datetime) FROM topten t2 GROUP BY home) GROUP BY datetime ORDER BY datetime DESC
Doesn't work. Result-set has 130 rows although database holds 187. Result includes some duplicates of home.
-- 2 ..join SELECT s1.id, s1.home, REPLY 0 views 0 likes 0 shares Facebook Twitter Linked In WhatsApp
-- Test data DECLARE @TestTable TABLE (id INT, home INT, date DATETIME, player VARCHAR(20), resource INT) INSERT INTO @TestTable SELECT 1, 10, '2009-03-04', 'john', 399 UNION SELECT 2, 11, '2009-03-04', 'juliet', 244 UNION SELECT 5, 12, '2009-03-04', 'borat', 555 UNION SELECT 3, 10, '2009-03-03', 'john', 300 UNION SELECT 4, 11, '2009-03-03', 'juliet', 200 UNION SELECT 6, 12, '2009-03-03', 'borat', 500 UNION SELECT 7, 13, '2008-12-24', 'borat', 600 UNION SELECT 8, 13, '2009-01-01', 'borat', 700 -- Answer SELECT id, home, date, player, resource FROM (SELECT id, home, date, player, resource, RANK() OVER (PARTITION BY home ORDER BY date DESC) N FROM @TestTable )M WHERE N = 1 -- and if you really want only home with max date SELECT T.id, T.home, T.date, T.player, T.resource FROM @TestTable T INNER JOIN ( SELECT TI.id, TI.home, TI.date, RANK() OVER (PARTITION BY TI.home ORDER BY TI.date) N FROM @TestTable TI WHERE TI.date IN (SELECT MAX(TM.date) FROM @TestTable TM) )TJ
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