复合索引顺序MySQL查询

我想优化下面的mysql查询。它运行约2.5秒。我已经阅读了复合索引，但我希望有人能够帮助我理解你如何将复合索引与这些包含多个联接的查询复合，其中许多条件（包括日期范围），一个组合以及一个order by一个计算值。我是否缺少有用的复合索引？有没有更有效的方法，我应该从这些表中提取数据？任何帮助非常感谢！复合索引顺序MySQL查询

SELECT 
branch.name AS branch, 
SUM(appointment.status = 'completed') AS `Completed`, 
SUM(appointment.status = 'cancelled') AS `Cancelled`, 
SUM(appointment.status = 'not completed') AS `Not Completed`, 
SUM(appointment.status != 'rescheduled') AS `Total` 
FROM rep 
JOIN customer ON rep.id = customer.rep_id 
JOIN office ON rep.office_id = office.id 
JOIN appointment ON customer.id = appointment.customer_id 
JOIN branch ON office.branch_id = branch.id 
WHERE rep.active= 1 
AND rep.group IN (1,2,3) 
AND rep.deleted = 0 
AND customer.saved = 0 
AND (customer.rep_id != appointment.closed_by OR appointment.closed_by IS NULL) 
AND customer.rep_id != 0 
AND customer.deleted = 0 
AND office.visible = 1 
AND office.deleted = 0 
AND appointment.date >= '2016-12-01' 
AND appointment.date < '2017-11-30' 
AND appointment.current = 1 
GROUP BY branch.id 
ORDER BY Completed

这里是EXPLAIN输出：

id: 1 
select_type: simple 
table: office 
type: ref 
possible_keys: PRIMARY, deleted_branchID_name, deleted_visible 
key: deleted_visible 
key_len: 5 
ref: const,const 
rows: 73 
Extra: Using index condition; Using temporary; Using filesort 

id: 1 
select_type: simple 
table: branch 
type: eq_ref 
possible_keys: PRIMARY 
key: PRIMARY 
key_len: 4 
ref: office.branch_id 
rows: 1 
Extra: NULL 

id: 1 
select_type: simple 
table: rep 
type: ref 
possible_keys: PRIMARY, group_id, office_id, active_deleted 
key: office_id 
key_len: 5 
ref: office.id 
rows: 57 
Extra: Using index condition; Using where 

id: 1 
select_type: simple 
table: customer 
type: ref 
possible_keys: PRIMARY, rep_id 
key: rep_id 
key_len: 4 
ref: rep.id 
rows: 61 
Extra: Using where 

id: 1 
select_type: simple 
table: appointment 
type: ref 
possible_keys: date, customer_id, closedByID_date, isCurrent_date 
key: customer_id 
key_len: 4 
ref: customer.id 
rows: 1 
Extra: Using where

来源

2017-06-23 b.digg

周围不知道你的数据进行任何删除无用的（），您的查询暗示索引'办公室（删除，可见，branch_id）'。然而，这张表似乎只包含少数几行，因此这个索引可能没有多大帮助;要选择更好的策略，您可以尝试识别强大的过滤器。如果例如99％的数据将具有'customer.saved = 1'或'appointment.current！= 1'，您可以尝试使用它来优化您的查询 - 但这取决于您的数据。另外，为了清楚起见，你应该用'join'来替换除最后一个'left join'（如果'office.branch_id'为'not null'，那么最后一个也是如此） – Solarflare

一个建议

条件

LEFT JOIN customer ON rep.id = customer.rep_id 
    LEFT JOIN office ON rep.office_id = office.id 
    LEFT JOIN appointment ON customer.id = appointment.customer_id 
    LEFT JOIN branch ON office.branch_id = branch.id

来源

2017-06-23 05:19:52 scaisEdge

复合索引顺序MySQL查询

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