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我是我的子查詢是嚴重放緩我在MySQL中的完整查詢。我正在將原始查詢轉換爲在MySQL上工作,因爲我正在離開SQL Server,它已經很好地工作了。另一方面MySQL不太高興。想知道是否有人可以協助我爲轉換解決方案提供幫助,因爲我還不完全熟悉連接。謝謝!轉換子查詢加入幫助
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)減慢您的查詢的子查詢? 如果有,是否有crm_assigned_id上的索引? –