mysql - 在多个表中排序匹配

Question

我正在使用这样的查询:

SELECT p.name, d.overview
FROM products AS p 
LEFT JOIN descriptions AS d ON p.DescriptionID = d.ID 
WHERE MATCH (p.name) AGAINST ('ram' IN BOOLEAN MODE) > 0 
OR MATCH (d.overview) AGAINST ('ram' IN BOOLEAN MODE) > 0;

如何对此结果进行相关排序？

我已经尝试过

ORDER BY MATCH (p.name) AGAINST ('ram' IN BOOLEAN MODE) 
OR MATCH (d.overview) AGAINST ('ram' IN BOOLEAN MODE) DESC

但这并没有帮助，因为结果没有根据相关性进行排序。

Answer 1

MATCH ... OR MATCH ...
          ^^

or 使其成为二进制表达式。二进制表达式的计算结果为 true 或 false。所以你要对它们是否匹配进行排序。因为 where 子句已经确保所有行匹配，所以这并不是不添加排序。

尝试按整数表达式排序，例如相关性之和:

ORDER BY
    MATCH (p.name) AGAINST ('ram' IN BOOLEAN MODE) +
    MATCH (d.overview) AGAINST ('ram' IN BOOLEAN MODE) DESC