MYSQL升级GROUP BY子句;这是不符合sql_mode = only_full_group_by

Question

我们已经升级了MYSQL数据库;

SELECT l.subscriberid AS subscriberid FROM email_list_subscribers AS l, email_queues AS q 
      WHERE q.recipient = l.subscriberid AND q.queueid = 2343 AND queuetype = 'send' 
      AND l.listid IN (31) GROUP BY l.emailaddress HAVING COUNT(l.emailaddress) > 1 

，现在我们得到

#1055 - Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'emailmarketer.l.subscriberid' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by 

我们能做些什么？

Answer 1

试试这个：

SELECT l.emailaddress, 
     GROUP_CONCAT(l.subscriberid) AS subscriberids 
FROM email_list_subscribers l JOIN 
    email_queues q 
    ON q.recipient = l.subscriberid 
WHERE q.queueid = 2343 AND queuetype = 'send' AND 
     l.listid IN (31) 
GROUP BY l.emailaddress 
HAVING COUNT(l.emailaddress) > 1; 

注：

• 决不的FROM子句中使用逗号。 总是使用明确的，适当的JOIN语法。
• 这将返回每个电子邮件的订阅者列表。
• 如果有重复项，您可能需要GROUP_CONCAT(DISTINCT l.subscriberid)。