MySQL：获取每个选定行的相关结果

Question

我正在使用下面的基本选择查询来显示我的表中最新的20行。

SELECT * FROM my_table ORDER BY id DESC limit 0,20 

那么我想相关的结果上述每个选定的行...什么我目前做的是运行在之后在一个循环的每一行“PHP”查询..

SELECT * MATCH (title) 
AGAINST('$main_title'IN NATURAL LANGUAGE MODE)AS 
score FROM my_table MATCH(title) AGAINST('$main_title'IN NATURAL LANGUAGE MODE) 
HAVING score > 10 ORDER BY score DESC 

所以完整的“PHP”的代码如下所示：

<?php 
// First Query 
$query= mysql_query("SELECT * FROM my_table ORDER BY id DESC limit 0,20"); 
$result = mysql_query($query) 

while($row = mysql_fetch_array($result)){ 
echo "Main Topic: ".$row['title']; 
$main_title = $row['title']; 
    echo "Related to this Topic:"; 

    // Second Query 
    $related_query= mysql_query(" 
    SELECT * MATCH (title) 
    AGAINST('$main_title'IN NATURAL LANGUAGE MODE)AS 
    score FROM my_table MATCH(title) AGAINST('$main_title'IN NATURAL LANGUAGE MODE) 
    HAVING score > 10 ORDER BY score DESC 
    "); 
    $related_result = mysql_query($related_query) 

      while($related_row = mysql_fetch_array($related_result)){ 
      echo "<br>". $related_row['title']; 
    } 


} 
?> 

，但我知道，在非常低效运行的一个循环内的第二次查询，所以我想这些“相关的结果”也在主q uery（或在单独的单个查询，而无需在循环中运行）

基本上我正在寻找一种方法做同样的，更有效地..

是有办法我可以做这个？

谢谢

Answer 1

假设你只想拥有标题和分数，这个工作吗？

SELECT MATCH(title) AGAINST('$main_title' IN NATURAL LANGUAGE MODE) as SCORE, 
title FROM my_table WHERE 
MATCH(title) AGAINST('$main_title' IN NATURAL LANGUAGE MODE) 
AND score > 10 AND id<=20 ORDER BY score DESC; 

Answer 2

首先，我认为第二个查询更像是这样的：

SELECT mt.*, 
     MATCH (title) AGAINST('$main_title'IN NATURAL LANGUAGE MODE) AS score 
FROM my_table mt 
WHERE MATCH(title) AGAINST('$main_title' IN NATURAL LANGUAGE MODE) > 10 
ORDER BY score DESC; 

如果你想只为my_table 20个IDS做到这一点，那么使用子查询：

SELECT mt.*, 
     MATCH (title) AGAINST('$main_title'IN NATURAL LANGUAGE MODE) AS score 
FROM (select mt.* 
     from my_table mt 
     order by id desc 
     limit 0, 20 
    ) mt 
WHERE MATCH(title) AGAINST('$main_title' IN NATURAL LANGUAGE MODE) > 10 
ORDER BY score DESC;