Question

我有多个表，不同的列，相应地设置全文索引。如果我只想搜索一个表，因为得分会按相关性对数据进行排序，这没有问题。但是我有多个表，我使用UNION来表示这些sql SELECT语句如下：

$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 (?)
;")->...

我如何才能获得这些表的相关性？现在，无论分数数据将按照表格的顺序显示，我都会选择。

感谢。

For a possible solution by an autor himself see this link

Answer 1

两个选项：

创建一个视图，然后您可以通过从视图中进行选择来进行排序。
将您的查询放入（嵌套查询为as with table），并按顺序排序。请参阅：http://dev.mysql.com/doc/refman/5.0/en/from-clause-subqueries.html

以下是我自己的数据示例（仅用于示例目的）：

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

因此，使用您自己的示例，它将类似于：

    $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`;")

mysql联合搜索（多个表）维护相关性

1 个答案: