GROUP BY功能不起作用

Question

更新wamp php 5.6和windows 10之后...，GROUP BY功能不起作用，在windows 7和以前的wamp工作正常。在代码或瓦特或窗口或..中有错，否则？

$sql = "SELECT * FROM user JOIN messages ON userID = usertwo WHERE userone = $user GROUP BY usertwo ORDER BY MAX(date) DESC LIMIT 10"; 
       $result = $con->query($sql); 

       if ($result->num_rows > 0) { 
       // output data of each row 
       while($row = $result->fetch_assoc()) { 

---没有GROUP BY和（）MAX不工作

但正常工作

$sql = "SELECT * FROM user JOIN messages ON userID = usertwo WHERE userone = $user ORDER BY date DESC LIMIT 10"; 
       $result = $con->query($sql); 

       if ($result->num_rows > 0) { 
       // output data of each row 
       while($row = $result->fetch_assoc()) { 

Answer 1

谢谢你，你是最好的，在新的PHP 5.6，你必须选择列，没有更多的使用*，在以前的版本不工作湖...

$ sql =“SELECT userID，firstname，lastname FROM user JOIN messages ON userID = usertwo WHERE userone = $ user GROUP BY usertwo ORDER BY MAX日期）DESC LIMIT 10“; $ result = $ con> query（$ sql）;

    if ($result->num_rows > 0) { 
       // output data of each row 
       while($row = $result->fetch_assoc()) { 

感谢：Farkie，克利须那帕特尔...