[英]PHP / MySQL Join Query
does anyone know the best solution to join this query into 1 query rather than 2 as i cannot get it working you see. 有没有人知道将此查询加入1个查询而不是2的最佳解决方案,因为我无法让它看起来有效。
function fn_order_category_get_order_info($cat_id)
{
$id1 = db_query("SELECT category_id FROM ?:products_categories WHERE product_id = $cat_id");
$id2 = db_query("SELECT category FROM ?:category_descriptions WHERE category_id = $id1");
return $id2;
}
Thanks in advance! 提前致谢!
Try this: 尝试这个:
SELECT
pc.category_id,
cd.category
FROM
products_categories pc
LEFT JOIN
category_descriptions cd
ON pc.category_id = cd.category_id
WHERE product_id = $product_id ;
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