Question

我有类似以下的MySQL查询：

SELECT *, MATCH (`Description`) AGAINST ('+ipod +touch ' IN BOOLEAN MODE) * 8 + MATCH(`Description`) AGAINST ('ipod touch' IN BOOLEAN MODE) AS Relevance
FROM products WHERE ( MATCH (`Description`) AGAINST ('+ipod +touch' IN BOOLEAN MODE) OR MATCH(`LongDescription`) AGAINST ('+ipod +touch' IN BOOLEAN MODE) )
HAVING Relevance > 1
ORDER BY Relevance DESC

现在，我通过搜索UPC使查询更加先进：

SELECT *, MATCH (`Description`) AGAINST ('+ipod +touch ' IN BOOLEAN MODE) * 8 + MATCH(`Description`) AGAINST ('ipod touch' IN BOOLEAN MODE) + `UPC` = '123456789012' * 16 AS Relevance
FROM products WHERE ( MATCH (`Description`) AGAINST ('+ipod +touch' IN BOOLEAN MODE) OR MATCH(`LongDescription`) AGAINST ('+ipod +touch' IN BOOLEAN MODE) ) AND `UPC` = '123456789012'
HAVING Relevance > 1
ORDER BY Relevance DESC

这将返回结果，但我在UPC上成功匹配的事实并没有增加Relevance的值。我是否可以仅使用MATCH（）AGAINST（）？

等全文搜索进行此类计算

澄清：好的，我真正的问题是，为什么以下没有相关性＆gt; = 16？

SELECT `UPC`, `UPC` = '123456789012' * 16 AS Relevance FROM products WHERE `UPC` = '123456789012' HAVING Relevance > 1 ORDER BY Relevance DESC

Answer 1

首先，我认为在SELECT中再次使用UPC = '123455778'是多余的。你不会得到任何不正确的行，所以为什么不使用“1”？

话虽如此，我认为您的问题是运营秩序。将括号中的比较括在我身上：

SELECT 
    `UPC`,
    (`UPC` = '12346790') * 16 AS Relevance
FROM 
    `products`
WHERE
    `UPC` = '12346790'
HAVING
    Relevance > 1
ORDER BY 
    Relevance DESC

如何在高级MySQL查询中增加相关性值？

1 个答案: