這是MYSQL還是PHP錯誤？ 當mysql_fetch_array時

Question

我有這樣的錯誤：

Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in C:\xampp\htdocs\lab\try.php on line 40

查詢是：

$graphquery = mysql_query ("SELECT
  $cluster,
  SUM(IF(idx=3,1,0)) AS green,
  SUM(IF(idx=2,1,0)) AS yellow,
  SUM(IF(idx=1,1,0)) AS red
FROM (SELECT
        $cluster
        $xcond
        ,LEAST(999 $acond) idx 
      FROM table
      WHERE date >= '". $startDate ."'
          AND date <= '". $endDate ."'
          AND $regional = '$gregcond'
          AND $latitude IS NOT NULL 
      GROUP BY $cluster, $lac, $mainid
      HAVING $cluster IS NOT NULL
$paraxcond
      ) A
GROUP BY $cluster");

如果我回顯查詢，它將是這樣的（沒有錯誤，完美的結果太btw）：

SELECT
  cluster,
  SUM(IF(idx=3,1,0)) AS green,
  SUM(IF(idx=2,1,0)) AS yellow,
  SUM(IF(idx=1,1,0)) AS red
FROM (SELECT
        cluster,
        ROUND(AVG(some_value_Index))    some_value_Index,
        LEAST(999, AVG(some_value_Index) )    idx
      FROM TABLE
      WHERE tanggal >= '2012-07-10'
          AND tanggal <= '2012-08-02'
          AND Regional = 'Regional_Example'
          AND Latitude IS NOT NULL
      GROUP BY cluster, Lac, ID
      HAVING cluster IS NOT NULL
          AND some_value_Index IN(3,2,1)) A
GROUP BY cluster

當我在該腳本上添加mysql_error時，它聽起來像這樣：

Incorrect parameter count in the call to native function 'LEAST'

以下是我願意使用MYSQL查詢的方法：

$row = mysql_fetch_array ($graphquery)

當我在ECHO查詢並在SQLYOG或PHPMYADMIN上嘗試時，沒有包含錯誤，所以有誰能告訴我錯誤在哪里？

Answer 1

您錯過了LEAST（）函數中的逗號。 至少需要2個或更多參數。 所以查詢將是。

mysql_query ("SELECT
  $cluster,
  SUM(IF(idx=3,1,0)) AS green,
  SUM(IF(idx=2,1,0)) AS yellow,
  SUM(IF(idx=1,1,0)) AS red
FROM (SELECT
        $cluster
        $xcond
        ,LEAST(999, $acond) idx 
      FROM table
      WHERE date >= '". $startDate ."'
          AND date <= '". $endDate ."'
          AND $regional = '$gregcond'
          AND $latitude IS NOT NULL 
      GROUP BY $cluster, $lac, $mainid
      HAVING $cluster IS NOT NULL
$paraxcond
      ) A
GROUP BY $cluster");

我把LEAST(999 $acond)改為LEAST(999 $acond) LEAST(999, $acond)