GROUP BY不返回正確的結果

這個查詢GROUP BY不返回正確的結果

SELECT releases.id,releases.label_no_country,releases.date 
FROM releases 
INNER JOIN labels_user_has_recd luhr 
ON luhr.label=releases.label_no_country 
WHERE luhr.user='Si Quick' 
GROUP BY releases.id 
HAVING datediff(now(),releases.date) < 90 
ORDER BY releases.date DESC 
LIMIT 0,10

給

id label_no_country date 
605639 Church 2016-04-28 
595303 Uncanny Valley 2016-04-21 
605806 Dekmantel 2016-04-21 
607276 Uncanny Valley 2016-04-21 
604280 Delsin 2016-04-21 
598653 Another Picture  2016-04-21 
605016 Skylevel 2016-04-20 
606342 Retreat  2016-04-14 
599363 Frank Music  2016-04-12 
599320 Spazio Disponibile 2016-04-08

我想在label_no_count列不返回任何重複的（即不是Uncanny Valley兩次。

我曾嘗試在以下查詢中使用GROUP BY

SELECT releases.id,releases.label_no_country,releases.date 
FROM releases 
INNER JOIN labels_user_has_recd luhr 
ON luhr.label=releases.label_no_country 
WHERE luhr.user='Si Quick' 
GROUP BY releases.label_no_country 
HAVING datediff(now(),releases.date) < 90 
ORDER BY releases.date DESC 
LIMIT 0,10

但這隻能返回一個結果，而不是刪除重複

id label_no_country date 
599320 Spazio Disponibile 2016-04-08

來源

2016-04-29 Franco

有沒有聚合函數在這裏，所以GROUP BY沒有任何用處。並且decorum阻止我說出我對提供沒有數據集的結果集的看法 – Strawberry

感覺不需要數據集，因爲它很可能會成爲查詢中的錯誤...已被接受的答案證明。 – Franco

移動HAVING到WHERE條件像

WHERE datediff(now(),releases.date) < 90

您的查詢應該是

SELECT releases.id,releases.label_no_country,releases.date 
FROM releases 
INNER JOIN labels_user_has_recd luhr 
ON luhr.label=releases.label_no_country 
WHERE luhr.user='Si Quick' 
AND datediff(now(),releases.date) < 90 
GROUP BY releases.label_no_country 
ORDER BY releases.date DESC 
LIMIT 0,10

來源

2016-04-29 07:46:05 Rahul

非常感謝。 – Franco

GROUP BY不返回正確的結果

回答

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