MySQL的全文搜索結果相關性

Question

我有以下的「銀行」表

ID | name 

1 | JPMorgan Chase bank 
2 | Bank of south 
3 | Citigroup bank 
4 | Wells Fargo bank 
5 | Bank of New York 

因此，當用戶搜索「銀行」我想要的搜索結果返回如下：

Bank of New York 
Bank of south 
Citigroup bank 
JPMorgan Chase bank 
Wells Fargo bank 

但我在它下面的代碼返回：

JPMorgan Chase bank 
Bank of America 
Citigroup bank 
Wells Fargo bank 
Bank of New York 

這是代碼：

$search_term = 'bank of'; 

$sql2 = "SELECT *, 
     MATCH(name) AGAINST ('.$search_term.' IN BOOLEAN MODE) 
     AS relevance FROM banks 
     HAVING relevance > 0.8 
     ORDER BY relevance DESC"; 

謝謝！

Answer 1

......對，但我的選擇是什麼？

你可以嘗試這樣的事情

SELECT *, 
     MATCH(name) AGAINST ('bank of' IN BOOLEAN MODE) AS relevance, 
     name LIKE '%bank of%' AS full_match 
    FROM banks 
HAVING relevance > 0.8 
ORDER BY full_match DESC, relevance DESC, name 

結果：

 
| ID |    NAME | RELEVANCE | FULL_MATCH | 
|----|---------------------|-----------|------------| 
| 5 | Bank of New York |   1 |   1 | 
| 2 |  Bank of south |   1 |   1 | 
| 3 |  Citigroup bank |   1 |   0 | 
| 1 | JPMorgan Chase bank |   1 |   0 | 
| 4 | Wells Fargo bank |   1 |   0 | 

這裏是SQLFiddle演示