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我使用這個查詢來搜索標籤相似MYSQL:基數衝突:1242子查詢返回多於1行?
SELECT sites_id
FROM tags_to_sites
WHERE tags_id IN (SELECT tags_id FROM tags_to_sites WHERE sites_id= ?)
AND sites_id!= ?
GROUP BY sites_id
HAVING COUNT(*) = ( SELECT COUNT(*) FROM tags_to_sites
WHERE tags_id IN (SELECT tags_id FROM tags_to_sites WHERE sites_id= ?)
AND sites_id!= ?
GROUP BY sites_id
ORDER BY COUNT(*) DESC LIMIT 3)
,但我得到一個錯誤
SQLSTATE [21000]:基數違規:1242子查詢返回多個 比1排
有人知道爲什麼嗎?
你的子查詢返回3行(由'ORDER BY COUNT(*)DESC LIMIT 3'),你必須只返回1或重寫你的'having'聲明' (#)在' – SatanDmytro
好抓!所以我如何限制最終數組只有3個結果? shoudl我在限制範圍外移動限制3? – Francesco
你可以從表中添加一些數據並解釋你想要的查詢嗎? – SatanDmytro