mysql - 选择过滤条件及其计数

Question

我有两张桌子：

桌子Filters

id   INT(11) PRIMARY KEY
text VARCHAR(50)

桌子items

id    INT(11) PRIMARY KEY
title VARCHAR(255)

我想显示所有过滤器术语以及它们在标题中出现的次数

我目前正在使用此语句，但计数为零

SELECT  filters.text, 
        (SELECT COUNT(items.id) 
         FROM items 
         WHERE (items.title LIKE 'filters.text' OR 
                items.title LIKE '%filters.text' OR 
                items.title LIKE '%filters.text%' OR 
                items.title LIKE 'filters.text%')
        ) AS count
        FROM filters, items
GROUP BY filters.ID
ORDER BY filters.ID DESC

Answer 1

试试这个，

SELECT  a.text, COUNT(b.id) totalCount
FROM    filters a
        LEFT JOIN items b
            ON b.title LIKE CONCAT('%',a.text,'%')
GROUP BY a.text
ORDER BY totalCount DESC

• SQLFiddle 演示链接