What does a mysql

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mysql_fetch_array() expects parameter 1 to be resource, boolean given in select
Warning: mysql_fetch_* expects parameter 1 to be resource, boolean given error

Not much to explain. I am using the code listed above and getting the error listed below. I am pretty clueless about what this error means and would love an explanation.

Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in ...

$query = "SELECT id
         FROM table
          WHERE user!= '$username'
          AND reviewed is NULL
          Order By ABS (uploaderrating- $rating) - Case When catagory== '$catagory' Then 1 Else 0 End
          LIMIT 0,1";
    $result = mysql_query($query);
    $row1= mysql_fetch_array($result);
    $id1 = $row1[id];
    $_SESSION['reference1']= $id1;

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我发现了这个错误：当它应该是单个=时，我只是有一个double == 。

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