[英]Select top 10 authors with most articles published in MySQL really slow
[英]MySQL Select Top 10 Most Recurring Field Values
我需要查詢數據庫以返回列中的前10個最常見的值。 我現在正在使用這個:
$most_popular = ('
SELECT item_id
FROM active_members
WHERE component = "members"
AND type = "has_picture"
GROUP BY item_id
HAVING Count(*) = (SELECT Count(*)
FROM wp_ms_activity
GROUP BY item_id
ORDER BY Count(*) DESC
LIMIT 1)
' );
不過,這只會返回一個值,而且速度很慢。 有沒有更好的辦法? 我嘗試將限制1更改為10,並顯示“子查詢返回多個值”。
只需按每個item_id
的記錄數進行排序
SELECT item_id
FROM active_members
WHERE component = "members"
AND type = "has_picture"
GROUP BY item_id
order by count(*) desc
limit 10
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