mysql聯合搜索（多表）保持相關性

Question

我有多個表，不同的列，全文索引相應地設置。如果我想只搜索一個表格，因爲分數會按相關性排序數據，所以沒有任何問題。不過我有多個表，我用UNION這些SQL語句SELECT如下：

$this->dbi->prepare(" 
    SELECT `id`,'".PRE."pages' as `table`, MATCH(`title`,`content`) AGAINST (?) AS `score` FROM `".PRE."pages` WHERE MATCH(`title`,`content`) AGAINST (?) 
    UNION SELECT `id`,'".PRE."news' as `table`, MATCH(`title`,`content`) AGAINST (?) AS `score` FROM `".PRE."news` WHERE MATCH(`title`,`content`) AGAINST (?) 
    UNION SELECT `id`,'".PRE."comments' as `table`, MATCH(`title`, `content`) AGAINST (?) AS `score` FROM `".PRE."comments` WHERE MATCH(`title`, `content`) AGAINST(?) 
    UNION SELECT `id`,'".PRE."auction_auto' as `table`, MATCH(`manufacturer`,`model`,`location`,`other`,`contact`) AGAINST (?) AS `score` FROM `".PRE."auction_auto` WHERE MATCH(`manufacturer`,`model`,`location`,`other`,`contact`) AGAINST (?) 
;")->... 

我怎麼能有這麼多表關聯？現在無論按照我選擇的表格順序顯示分數數據。

謝謝。

For a possible solution by an autor himself see this link

Answer 1

兩個選項：

1. 創建一個視圖，將允許你做，然後從視圖中選擇排序。
2. 將你的查詢放在from（嵌套查詢as as table），並按順序排列。請參閱：http://dev.mysql.com/doc/refman/5.0/en/from-clause-subqueries.html

這裏是我自己的數據（僅作示例）的例子：

$this->dbi->prepare(" 
select * from 
(
     SELECT `id`,'".PRE."pages' as `table`, MATCH(`title`,`content`) AGAINST (?) AS `score` FROM `".PRE."pages` WHERE MATCH(`title`,`content`) AGAINST (?) 
     UNION SELECT `id`,'".PRE."news' as `table`, MATCH(`title`,`content`) AGAINST (?) AS `score` FROM `".PRE."news` WHERE MATCH(`title`,`content`) AGAINST (?) 
     UNION SELECT `id`,'".PRE."comments' as `table`, MATCH(`title`, `content`) AGAINST (?) AS `score` FROM `".PRE."comments` WHERE MATCH(`title`, `content`) AGAINST(?) 
     UNION SELECT `id`,'".PRE."auction_auto' as `table`, MATCH(`manufacturer`,`model`,`location`,`other`,`contact`) AGAINST (?) AS `score` FROM `".PRE."auction_auto` WHERE MATCH(`manufacturer`,`model`,`location`,`other`,`contact`) AGAINST (?) 
) as allTables order by `id`;") 

：

select * from 
(
    (select * from products where products_id >10) 
    UNION 
    (select * from products where products_id <= 10) 
) 
as SOURCE 
order by products_id 

用自己的例子這將是類似的東西

所以