运行代码时出现以下错误

Question

While I am running this code it showing me a following error:-

Column 'virtuemart_product_id' in where clause is ambiguous Can anyone tell me how to resolve it. Thank you.

<?php
    mysql_connect('localhost','root','');
    mysql_select_db('joom');
    $get=$_GET['virtuemart_product_id'];
    $get1=$_GET['virtuemart_category_id'];
    $sql="SELECT 
            btn9c_virtuemart_products_en_gb.virtuemart_product_id,
            btn9c_virtuemart_products_en_gb.product_s_desc, 
            btn9c_virtuemart_products_en_gb.product_desc, 
            btn9c_virtuemart_products_en_gb.product_name, 
            btn9c_virtuemart_product_prices.product_price 
          FROM btn9c_virtuemart_products_en_gb 
          JOIN btn9c_virtuemart_product_prices ON
            btn9c_virtuemart_products_en_gb.virtuemart_product_id=btn9c_virtuemart_product_prices.virtuemart_product_id 
          WHERE virtuemart_product_id='$get' ";
    if($result=mysql_query($sql))
    {
        while($row=mysql_fetch_assoc($result))
        {
            echo $row['product_price'];
        }
    }
    else 
    {
        echo (mysql_error());
    }       
?>

Answer 1

Put table name (or alias) with column names in where clause which are common between tables you are joining.

Try below:

$sql="SELECT 
        btn9c_virtuemart_products_en_gb.virtuemart_product_id,
        btn9c_virtuemart_products_en_gb.product_s_desc, 
        btn9c_virtuemart_products_en_gb.product_desc, 
        btn9c_virtuemart_products_en_gb.product_name, 
        btn9c_virtuemart_product_prices.product_price 
      FROM btn9c_virtuemart_products_en_gb 
      JOIN btn9c_virtuemart_product_prices ON
        btn9c_virtuemart_products_en_gb.virtuemart_product_id=btn9c_virtuemart_product_prices.virtuemart_product_id 
      WHERE  btn9c_virtuemart_products_en_gb.virtuemart_product_id='$get' ";

Answer 2

In your where clause the property virtuemart_product_id is not identified unambiguously by a table name. Just use the table prefix there as well.

SELECT 
  prod.virtuemart_product_id,
  prod.product_s_desc, 
  prod.product_desc, 
  prod.product_name, 
  prices.product_price 
FROM btn9c_virtuemart_products_en_gb prod
JOIN btn9c_virtuemart_product_prices prices ON
  prod.virtuemart_product_id=prices.virtuemart_product_id 
WHERE prod.virtuemart_product_id='$get'

Btw use aliases for the tablenames. Saves a lot of typing and makes things more readable.

Answer 3

只需将表名添加到查询的WHERE部分：

..."WHERE table_you_need.virtuemart_product_id='$get' ";