MySQL的布爾搜索的權重列

Question

我在mysql中3個表內啓用全文搜索：

標題（標題，URL），標題（標題，URL）和內容（內容URL）。

我的問題是這樣的：我想重比標題URL欄較多，標題欄比的標題多，比內容更標題。我能做到這一點用在需要每個學期布爾搜索，就像這樣：

SELECT * FROM title WHERE MATCH (title) 
AGAINST('+search' IN BOOLEAN MODE) 

Answer 1

MATCH ...AGAINST返回一個數字，和MySQL記得where子句的結果，所以如果你有1臺3個獨立的FT-指標，你可能只是做一個：

SELECT * FROM tablename WHERE 
    MATCH (title) AGAINST('search') 
    OR MATCH (headings) AGAINST('search') 
    OR MATCH (content) AGAINST('search') 
ORDER BY 
    (MATCH (title) AGAINST('search') * 3) + 
    (MATCH (headings) AGAINST('search') * 2) + 
    MATCH (content) AGAINST('content') DESC 

或任何的權重可能需要。

或者，在布爾模式，同一個表，你可以使用：

SELECT * FROM tablename WHERE 
    MATCH (title) AGAINST('>>>search' IN BOOLEAN MODE) 
    OR MATCH (headings) AGAINST('>>search' IN BOOLEAN MODE) 
    OR MATCH (content) AGAINST('>search' IN BOOLEAN MODE) 
ORDER BY 
    MATCH (title) AGAINST('>>>search' IN BOOLEAN MODE) + 
    MATCH (headings) AGAINST('>>search' IN BOOLEAN MODE) + 
    MATCH (content) AGAINST('>search' IN BOOLEAN MODE) 

對於需要在搜索關鍵詞的搜索，同樣的技巧：

MATCH (title) AGAINST('+>>>search' IN BOOLEAN MODE) 

如果你有3個獨立的表，必須在某個地方存儲重量，無論是在某個JOIN中，還是通過單獨的查詢（但現在都是這樣）：

SELECT *, MATCH (title) AGAINST('+>>>search' IN BOOLEAN MODE) as weight 
FROM title 
WHERE  MATCH (title) AGAINST('+>>>search' IN BOOLEAN MODE) 

SELECT *, MATCH (headings) AGAINST('+>>search' IN BOOLEAN MODE) as weight 
FROM headings 
WHERE  MATCH (headings) AGAINST('+>>search' IN BOOLEAN MODE) 

SELECT *, MATCH (content) AGAINST('+search' IN BOOLEAN MODE) as weight 
FROM content 
WHERE  MATCH (content) AGAINST('+search' IN BOOLEAN MODE)