Question

更新wamp php 5.6和windows 10后，GROUP BY功能无法正常工作，在Windows 7和之前的wamp工作正常。是代码中的错误还是wamp或windows或..，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()) {

---不工作

但没有GROUP BY和（）MAX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，你最好，在新的PHP 5.6中你必须选择列，不再使用*，而不是以前版本中的work湖...

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

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

感谢：Farkie，krishn patel ......

GROUP BY功能不起作用

1 个答案: