mysql counts the number of occurrences of a certain value in a column without using where

Others 2023-09-20 20:08:00 views: null

SELECT article_id,COUNT(article_like = 1 or null) AS like_count,
	   COUNT(article_like = 2 or null) AS dislike_count 
FROM ...

Put the condition in count. If it is true, it will be counted once. If it is false, it will be null and it will not be counted.

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Origin blog.csdn.net/ZHAI_KE/article/details/131591956

mysql counts the number of occurrences of a certain value in a column without using where

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