多左连接sql - 优化表模式或sql

Question

这是我的sql，它太慢了，请告诉我如何优化我的表架构或这个sql

SELECT 
    activityLog.id, activityLog.business_id, activityLog.business_typedict.label, 
    dict.id, callLog.id, callLog.duration, callLog.record_url, 
    leads.name AS "leads.name", customer.name AS "customer.name", 
    niche.name AS "niche.name", contacts.name AS "contacts.name", 
    task.name AS "task.name" 
FROM 
    biz_business_log activityLog 
    LEFT JOIN leads_leads leads 
        ON activityLog.business_type=1 AND activityLog.business_id=leads.id 
          AND EXISTS (SELECT 1 FROM sys_office 
                      WHERE 1 = 1 AND (id = '5' OR parent_ids LIKE '5,%') 
                          AND id=leads.office_id) 
    LEFT JOIN cust_customer customer 
        ON activityLog.business_type=2 AND activityLog.business_id=customer.id 
          AND EXISTS (SELECT 1 FROM sys_office 
                      WHERE 1 = 1 AND (id = '5' OR parent_ids LIKE '5,%') 
                          AND id=customer.office_id) 
    LEFT JOIN niche_niche niche 
        ON activityLog.business_type=3 AND activityLog.business_id=niche.id 
          AND EXISTS (SELECT 1 FROM sys_office 
                      WHERE 1 = 1 AND (id = '5' OR parent_ids LIKE '5,%') 
                          AND id=niche.office_id) 
    LEFT JOIN contacts_contacts contacts 
        ON activityLog.business_type=4 AND activityLog.business_id=contacts.id 
          AND EXISTS (SELECT 1 FROM sys_office 
                      WHERE 1 = 1 AND (id = '5' OR parent_ids LIKE '5,%') 
                          AND id=contacts.office_id) 
    LEFT JOIN task_task task 
        ON activityLog.business_type=5 AND activityLog.business_id=task.id 
          AND EXISTS (SELECT 1 FROM sys_office 
                      WHERE 1 = 1 AND (id = '5' OR parent_ids LIKE '5,%') 
                          AND id=task.office_id) 
    LEFT JOIN sys_dict dict 
        ON activityLog.activity_log_type = dict.value 
    LEFT JOIN biz_call_log callLog 
        ON callLog.business_log_id = activityLog.id 
WHERE 
    1=1 
    AND dict.type='activity_log_type' 
    AND dict.company_id = 2 
    AND activityLog.company_id = 2 
    AND dict.delete_flag = 0 
ORDER BY
    IFNULL(activityLog.update_time, activityLog.create_time) DESC 
LIMIT 
    0,20

解释：

Answer 1

因为dict没有使用索引并使用临时