Question

我试图用php mysql_query在mysql中平均几行，但我似乎遇到了一些问题..

    $ratingsql = "SELECT AVG(Rating) AS RatingAverage FROM wp_reciperatings;";
    $ratingresult = mysql_query($ratingsql);
    // Print out result
    while($ratingrow = mysql_fetch_array($ratingresult)){
        echo "The average rating is ".$ratingrow['AVG(RatingAverage)'];
        echo "<br />";

我的表看起来像..

          ID           Rating
        _______________________
        |  1      |        1  |
        |  1      |        2  |
        |  1      |        5  |

评分从1-5,5最佳。我能够将mysql查询打入我的sql客户端，它工作正常，怎么会在我的页面上不起作用？

另外，我如何计算一个id的平均值？

非常感谢！非常感谢。

Answer 1

改变这个 -

echo "The average price of  is ".$ratingrow['AVG(rating)'];

到此 -

echo "The average price of  is ".$ratingrow['RatingAverage '];

由于您为结果列提供了别名，因此您需要在PHP中使用该别名来显示数据。

对一个ID的平均值的查询将是 -

SELECT AVG(Rating) AS RatingAverage 
FROM wp_reciperatings
WHERE ID = '1'; // replacing with ID as needed

通过SQL查询和PHP平均

1 个答案: