mysql - 获取 MySQL 查询中返回的行数

Question

我在编写 MySQL 查询时遇到了一些问题。我想计算我的查询返回的行数，而不实际返回行，然后使用 mysql_num_rows 等。

我的查询如下：

SELECT COUNT(l.product_number_language) as counts, l.id, l.product_number, l.language,    l.product_number_language
FROM bs_products_languages l
LEFT JOIN bs_products p ON (l.product_number_language = p.product_number)
WHERE l.product_number = 'C4164' 
AND l.active='Y'
AND p.active='Y'
GROUP BY l.language

以下是返回的内容：

我真正想要的只是这些行的计数，所以在这种情况下为 3。

Answer 1

Select count(*)
From
(
    SELECT COUNT(l.product_number_language) as counts, l.id, l.product_number, 
        l.language, l.product_number_language
    FROM bs_products_languages l
    LEFT JOIN bs_products p ON (l.product_number_language = p.product_number)
    WHERE l.product_number = 'C4164' 
    AND l.active='Y'
    AND p.active='Y'
    GROUP BY l.language
) as t