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MySQL 查询在查询结果中给出重复数据。这是我试图避免它的方法。

实际查询：

$product_sql_test2 = $this->db->query("SELECT p.product_id, p.price,    pc.product_id AS product_id
    FROM oc_product p
        INNER JOIN oc_product_to_category pc ON p.product_id = pc.product_id
    WHERE p.price  BETWEEN '".$product_info['related_kv4nt_min_2']."' and '".$product_info['related_kv4nt_max_2']."'
        AND pc.category_id =  '".$product_info['related_kv4nt_id_2']."'
    GROUP BY pc.product_id
    ORDER BY RAND( ) 
    LIMIT 0 , 10");

这是我选择后所做的：

if(isset($product_sql_test2->row['product_id'])){$this->data['product_spec_2_'.$i.''] = $product_sql_test2->row['product_id'];}
    $i++;
}

$pr_unique2 = array_unique($this->data['product_spec_2_'.$i.'']);
if ($this->data['product_spec_2_'.$i.''] != $pr_unique2[$i]){
    $product_sql_test2 = $this->db->query("SELECT  p.product_id, p.price,    pc.product_id AS product_id
        FROM oc_product p
            LEFT JOIN oc_product_to_category pc ON p.product_id = pc.product_id
        WHERE p.price  BETWEEN '".$product_info['related_kv4nt_min_2']."' and '".$product_info['related_kv4nt_max_2']."'
            AND pc.category_id =  '".$product_info['related_kv4nt_id_2']."'
        GROUP BY pc.product_id
        ORDER BY RAND( ) 
        LIMIT 0 , 10");//$sql_price_minus = $product_info['price'] - ($product_info['price'] * 0.10);
    $this->data['product_spec_2_'.$i.''] = $product_sql_test2->row['product_id'];
    continue;
}

如何防止重复结果？

这是我编辑代码的方式，但收到一个错误，表示查询执行时间超过 30 秒。可以做什么？

$product_sql_test2 = $this->db->query("SELECT p.product_id, p.price,    pc.product_id AS product_id
FROM oc_product p
LEFT JOIN oc_product_to_category pc ON p.product_id = pc.product_id
WHERE p.price  BETWEEN '".$product_info['related_kv4nt_min_2']."' and '".$product_info['related_kv4nt_max_2']."'
AND pc.category_id =  '".$product_info['related_kv4nt_id_2']."'
GROUP BY pc.product_id
ORDER BY RAND() 
LIMIT 10");                        

if(isset($product_sql_test2->row['product_id'])){$this->data['product_spec_2_'.$i.''] = $product_sql_test2->row['product_id'];}
$data[]=$this->data['product_spec_2_'.$i.''];
$pr_unique = array_unique($data);

$i++;
if ($data != $pr_unique[$i]){
  $product_sql_test2 = $this->db->query("SELECT p.product_id, p.price,    pc.product_id AS product_id
FROM oc_product p
LEFT JOIN oc_product_to_category pc ON p.product_id = pc.product_id
WHERE p.price  BETWEEN '".$product_info['related_kv4nt_min_2']."' and '".$product_info['related_kv4nt_max_2']."'
AND pc.category_id =  '".$product_info['related_kv4nt_id_2']."'
GROUP BY pc.product_id
ORDER BY RAND() 
LIMIT 10");                        
    $i=1;
}
if(isset($product_sql_test2->row['product_id'])){$this->data['product_spec_2_'.$i.''] = $product_sql_test2->row['product_id'];}
$i++;
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