mysql - Mysql 查询 - 仅搜索最新的 x 行

Question

这是我在这里的第一个问题，所以我希望我做得对。我有以下 SQL 查询：

SELECT *, 
  MATCH(name, descr) AGAINST ('$q') AS score 
FROM songs 
WHERE MATCH (name, descr) AGAINST('$q') 
ORDER BY score DESC

您可能知道，如果描述或名称中存在匹配项，此查询将从songs表中的每一行中选择所有内容。我想要做的是将查询限制为仅搜索最新的 10k 行。我也有一个主键，id.

Answer 1

您将需要一个嵌套查询。尝试这个：

SELECT temp.*, 
  MATCH(name, descr) AGAINST ('$q') AS score
FROM (
    SELECT *
    FROM songs 
    ORDER BY id DESC
    LIMIT 10000
    ) temp
WHERE MATCH (name, descr) AGAINST('$q') 
ORDER BY score DESC

Answer 2

您可以ORDER BY score ASC（而不是DESC）添加LIMIT 10000并最终反转结果的顺序：

SELECT * FROM (
  SELECT *, 
    MATCH(name, descr) AGAINST ('$q') AS score 
  FROM songs 
  WHERE MATCH (name, descr) AGAINST('$q') 
  ORDER BY score ASC
  LIMIT 10000
) ORDER BY score DESC