[英]Ordering of grouped rows in mysql
SELECT t1.item_id, t1.item, t1.created, t1.owner, t1.type, t1.fld, t2.tag
FROM items AS t1
INNER JOIN tagged AS t2 ON t1.item_id = t2.item_id
WHERE tag
IN ('how', 'jkas', 'bodor', 'zimp', 'ctuo', 'sjex', 'kek'
)
GROUP BY item_id
ORDER BY t1.created DESC
LIMIT 0 , 100
如何根據商品與IN TAG的匹配次數來訂購商品? 我的手冊非常深入,找不到答案,我迷失了我不懂的東西。
您可以使用COUNT
並將結果放在子查詢中:
SELECT *
FROM (
SELECT t1.item_id, t1.item, t1.created, t1.owner,
t1.type, t1.fld, t2.tag, COUNT(DISTINCT t2.tag) tagCount
FROM items AS t1
INNER JOIN tagged AS t2 ON t1.item_id = t2.item_id
WHERE tag IN ('how', 'jkas', 'bodor', 'zimp', 'ctuo', 'sjex', 'kek')
GROUP BY item_id
) t
ORDER BY tagCount DESC, created DESC
LIMIT 0 , 100
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