Question

我正在准备一个MySQL全文搜索应用程序。

我有两个表：Books和Price。我需要在搜索执行时从两个表中获取数据。

Books架构：

id,name,title,active
1,Alex, Alex Bio,1
2,Bob, Bob Bio, 1

mysql fulltext index(name,title)

Price架构：

id,product_id,price
1,1,500
2,1,600
3,1,700
4,2,300
5,2,400
6,2,500

当我运行以下查询时，搜索工作正常，但我需要price;并且只有最低price应与product_id一起显示。

以下是我的完整查询：

SELECT *,
  MATCH (name, title)
    AGAINST ('" . $search . "' IN BOOLEAN MODE) AS "high"
  FROM books
  WHERE MATCH (name, title) AGAINST ('" . $search . "' IN BOOLEAN MODE)
    AND active = 1
  ORDER BY high DESC;

预期产出：

id,name,title,price
1,Alex,Alex Bio,500
2,Bod,Bob Bio,300

Answer 1

您需要加入才能完成这项工作：

SELECT t1.id, t1.name, t1.title, COALESCE(t2.minPrice, 'NA') AS price
FROM books t1
LEFT JOIN
(
    SELECT product_id, MIN(price) AS minPrice
    FROM price
    GROUP BY product_id
) t2
    ON t1.id = t2.product_id
WHERE MATCH (name,title) AGAINST ('" . $search . "' IN BOOLEAN MODE) AND active = 1
ORDER BY MATCH (name,title) AGAINST ('" . $search . "' IN BOOLEAN MODE) DESC

Answer 2

只需将价格表加入书籍，获得最低价格并添加group by子句：

SELECT books.id, name, title, min(p.price)
FROM books
INNER JOIN price p on p.product_id=books.id
WHERE MATCH (name,title) AGAINST ('" . $search . "' IN BOOLEAN MODE) AND active = 1
GROUP BY books.id, name, title
ORDER BY MATCH (name,title) AGAINST ('" . $search . "' IN BOOLEAN MODE) DESC

使用Left加入另一个表的Mysql全文搜索

2 个答案: