如何根據相關性對全文索引搜索的結果進行排序

Question

嗨我有問題根據相關性排序我的SQL查詢的結果。

這是我目前的疑問。

SELECT author FROM search WHERE MATCH(author,title,series) AGAINST('Anna Selby' in BOOLEAN MODE) 

任何人都可以告訴我如何根據相關性對結果進行排序的解決方案

Answer 1

您可以選擇匹配作為查詢的一部分，然后將其作為“分數”返回。 然后你可以對它進行排序。 IE：

SELECT 
  author,
  MATCH(author,title,series) AGAINST('Anna Selby' in BOOLEAN MODE) as score
FROM 
  search 
WHERE 
  MATCH(author,title,series) AGAINST('Anna Selby' in BOOLEAN MODE)
ORDER BY
  score

更新：這是一個加權的例子

SELECT 
  author,
  (
   (MATCH(author) AGAINST('Anna Selby' in BOOLEAN MODE) * 20) +
   (MATCH(title) AGAINST('Anna Selby' in BOOLEAN MODE) * 10) +
   (MATCH(series) AGAINST('Anna Selby' in BOOLEAN MODE) * 5)) as score
FROM 
  search 
WHERE 
  MATCH(author,title,series) AGAINST('Anna Selby' in BOOLEAN MODE)
ORDER BY
  score