0
我是我的子查询是严重放缓我在MySQL中的完整查询。我正在将原始查询转换为在MySQL上工作,因为我正在离开SQL Server,它已经很好地工作了。另一方面MySQL不太高兴。想知道是否有人可以协助我为转换解决方案提供帮助,因为我还不完全熟悉连接。谢谢!转换子查询加入帮助
select a.crm_ticket_details_detail,
crm_ticket_created_date,
crm_ticket_id,
crm_ticket_customer_id,
c.crm_assigned_user
from php_crm.crm_ticket,
php_crm.crm_ticket_details a,
php_crm.crm_assigned c
where crm_ticket_resolved_date is null
and crm_ticket_id = a.crm_ticket_details_ticket_id
and a.crm_ticket_details_type = 'issue'
and c.crm_assigned_ticket_id = crm_ticket_id
and c.crm_assigned_id = (select max(d.crm_assigned_id)
from php_crm.crm_assigned d
where d.crm_assigned_ticket_id = crm_ticket_id)
只是最大(d.crm_assigned_id)减慢您的查询的子查询? 如果有,是否有crm_assigned_id上的索引? –