Question

我的SQL语句在另一台本地服务器上工作正常，但在最近安装的灯服务器中尝试我的项目后，它显示以下错误 -

SELECT列表的表达式＃2不在GROUP BY子句中并且包含 nonaggregated column＆＃39; newmesssages.send_date＆＃39;不是功能上依赖于GROUP BY子句中的列;这是与sql_mode = only_full_group_by
不兼容

声明 -

SELECT COUNT(reciever) as total, send_date, message, sender_username, sender_name 
FROM (SELECT * FROM messages_view WHERE reciever = 17 AND viewed_by_reciever is NULL order by send_date DESC) 
AS newmesssages 
GROUP BY sender ORDER BY send_date DESC LIMIT 20

Answer 1

您需要按所有未汇总的列进行分组，如下所示：

SELECT COUNT(reciever) as total, send_date, message, sender_username, sender_name 
FROM (SELECT * 
     FROM messages_view 
     WHERE reciever = 17 AND viewed_by_reciever is NULL order by send_date DESC) 
     AS newmesssages 
GROUP BY send_date, message, sender_username, sender_name 
ORDER BY send_date DESC LIMIT 20

如果您不想按这些列进行分组，则需要将它们从SELECT中删除。

另一个解决方案是改变sql_mode这样做：

SET SESSION sql_mode = REPLACE(@@sql_mode, ',only_full_group_by', '');

最后，您的SQL中出现了错误，您按sender进行分组但没有该列名称

<强> EDITED ：你可以这样做：

SELECT (SELECT COUNT(reciever)  
        FROM (SELECT * 
              FROM messages_view 
              WHERE reciever = 17 AND viewed_by_reciever is NULL 
              order by send_date DESC) AS newmesssages 
        GROUP BY send_date, message, sender_username, sender_name),
        send_date, message, sender_username, sender_name 
FROM (SELECT * 
     FROM messages_view 
     WHERE reciever = 17 AND viewed_by_reciever is NULL order by send_date DESC) 
ORDER BY send_date DESC LIMIT 20

我认为这可以起作用

Answer 2

此查询代码ONLY_FULL_GROUP_BY禁用

对于Mysql：-在查询中使用此代码：

$set_mode = "SET sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY',''))"; $resultss = mysqli_query($this->dbh,$set_mode);

对于codeigniter：-在查询中使用此代码：

$this->db->query("SET sql_mode=(SELECT REPLACE(@@sql_mode, 'ONLY_FULL_GROUP_BY', ''));") ;

关于你：

$set_mode = "SET sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY',''))"; $resultss = mysqli_query($this->dbh,$set_mode);
SELECT COUNT(reciever) as total, send_date, message, sender_username, sender_name 
FROM (SELECT * FROM messages_view WHERE reciever = 17 AND viewed_by_reciever is NULL order by send_date DESC) 
AS newmesssages 
GROUP BY sender ORDER BY send_date DESC LIMIT 20

＆＃34;的sql_mode = only_full_group_by＆＃34;不兼容错误

2 个答案: