我有以下查询（简化）：
EXPLAIN (SELECT phppos_sales.deleted as deleted,phppos_sales.deleted_by as deleted_by, sale_time, date(sale_time) as sale_date,
phppos_sales_items.sale_id, comment,payment_type, customer_id, employee_id, phppos_items.item_id, NULL as item_kit_id,
supplier_id, quantity_purchased, item_cost_price, item_unit_price, category, discount_percent
FROM phppos_sales_items
INNER JOIN phppos_sales FORCE INDEX (sales_search) ON phppos_sales_items.sale_id=phppos_sales.sale_id
INNER JOIN phppos_items ON phppos_sales_items.item_id=phppos_items.item_id
LEFT OUTER JOIN phppos_suppliers ON phppos_items.supplier_id=phppos_suppliers.person_id
LEFT OUTER JOIN phppos_sales_items_taxes ON phppos_sales_items.sale_id=phppos_sales_items_taxes.sale_id and phppos_sales_items.item_id=phppos_sales_items_taxes.item_id and phppos_sales_items.line=phppos_sales_items_taxes.line
WHERE sale_time BETWEEN "2014-03-01 00:00:00" and "2014-03-31 23:59:59" and phppos_sales.location_id='1' and phppos_sales.store_account_payment=0)
+----+-------------+--------------------------+--------+-----------------+--------------+---------+-------------------------------------------------------------------------------------+-------+-------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+--------------------------+--------+-----------------+--------------+---------+-------------------------------------------------------------------------------------+-------+-------------+
| 1 | SIMPLE | phppos_sales | range | sales_search | sales_search | 12 | NULL | 13098 | Using where |
| 1 | SIMPLE | phppos_sales_items | ref | PRIMARY,item_id | PRIMARY | 4 | pos.phppos_sales.sale_id | 1 | |
| 1 | SIMPLE | phppos_items | eq_ref | PRIMARY | PRIMARY | 4 | pos.phppos_sales_items.item_id | 1 | |
| 1 | SIMPLE | phppos_suppliers | ref | person_id | person_id | 4 | pos.phppos_items.supplier_id | 1 | Using index |
| 1 | SIMPLE | phppos_sales_items_taxes | ref | PRIMARY,item_id | PRIMARY | 12 | pos.phppos_sales.sale_id,pos.phppos_sales_items.item_id,pos.phppos_sales_items.line | 1 | Using index |
+----+-------------+--------------------------+--------+-----------------+--------------+---------+-------------------------------------------------------------------------------------+-------+-------------+
mysql> show create table phppos_sales;
+--------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+--------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| phppos_sales | CREATE TABLE `phppos_sales` (
`sale_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
`customer_id` int(10) DEFAULT NULL,
`employee_id` int(10) NOT NULL DEFAULT '0',
`comment` text COLLATE utf8_unicode_ci NOT NULL,
`show_comment_on_receipt` int(1) NOT NULL DEFAULT '0',
`sale_id` int(10) NOT NULL AUTO_INCREMENT,
`payment_type` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`cc_ref_no` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`auth_code` varchar(255) COLLATE utf8_unicode_ci DEFAULT '',
`deleted_by` int(10) DEFAULT NULL,
`deleted` int(1) NOT NULL DEFAULT '0',
`suspended` int(1) NOT NULL DEFAULT '0',
`store_account_payment` int(1) NOT NULL DEFAULT '0',
`location_id` int(11) NOT NULL,
PRIMARY KEY (`sale_id`),
KEY `customer_id` (`customer_id`),
KEY `employee_id` (`employee_id`),
KEY `deleted` (`deleted`),
KEY `location_id` (`location_id`),
KEY `phppos_sales_ibfk_4` (`deleted_by`),
KEY `suspended` (`suspended`),
KEY `sales_search` (`sale_time`,`location_id`,`store_account_payment`,`suspended`),
CONSTRAINT `phppos_sales_ibfk_3` FOREIGN KEY (`location_id`) REFERENCES `phppos_locations` (`location_id`),
CONSTRAINT `phppos_sales_ibfk_4` FOREIGN KEY (`deleted_by`) REFERENCES `phppos_employees` (`person_id`)
) ENGINE=InnoDB AUTO_INCREMENT=109948 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci |
+--------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
完整查询（未简化）：
EXPLAIN (SELECT phppos_sales.deleted as deleted,phppos_sales.deleted_by as deleted_by, sale_time, date(sale_time) as sale_date, phppos_sales_items.sale_id, comment,payment_type, customer_id, employee_id, phppos_items.item_id, NULL as item_kit_id, supplier_id, quantity_purchased,
item_cost_price, item_unit_price, category, discount_percent,
(item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100) as subtotal,
phppos_sales_items.line as line, serialnumber, phppos_sales_items.description as description,
(item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100)+(item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) +(((item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) + (item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100)) *(SUM(CASE WHEN cumulative = 1 THEN percent ELSE 0 END))/100) as total,
(item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) +(((item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) + (item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100)) *(SUM(CASE WHEN cumulative = 1 THEN percent ELSE 0 END))/100) as tax,
(item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100) - (item_cost_price*quantity_purchased) as profit
FROM phppos_sales_items INNER JOIN phppos_sales FORCE INDEX (sales_search) ON phppos_sales_items.sale_id=phppos_sales.sale_id
INNER JOIN phppos_items ON phppos_sales_items.item_id=phppos_items.item_id
LEFT OUTER JOIN phppos_suppliers ON phppos_items.supplier_id=phppos_suppliers.person_id
LEFT OUTER JOIN phppos_sales_items_taxes ON phppos_sales_items.sale_id=phppos_sales_items_taxes.sale_id and phppos_sales_items.item_id=phppos_sales_items_taxes.item_id and phppos_sales_items.line=phppos_sales_items_taxes.line
WHERE sale_time BETWEEN "2014-03-01 00:00:00" and "2014-03-31 23:59:59" and phppos_sales.location_id='1' and phppos_sales.store_account_payment=0 GROUP BY sale_id, item_id, line)
UNION ALL
(SELECT phppos_sales.deleted as deleted,phppos_sales.deleted_by as deleted_by, sale_time, date(sale_time) as sale_date, phppos_sales_item_kits.sale_id, comment,payment_type, customer_id, employee_id, NULL as item_id, phppos_item_kits.item_kit_id, '' as supplier_id, quantity_purchased, item_kit_cost_price, item_kit_unit_price, category, discount_percent,
(item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100) as subtotal,
phppos_sales_item_kits.line as line, '' as serialnumber, phppos_sales_item_kits.description as description, (item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100)+(item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) +(((item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) + (item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100)) *(SUM(CASE WHEN cumulative = 1 THEN percent ELSE 0 END))/100) as total,
(item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) +(((item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) + (item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100)) *(SUM(CASE WHEN cumulative = 1 THEN percent ELSE 0 END))/100) as tax,
(item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100) - (item_kit_cost_price*quantity_purchased) as profit
FROM phppos_sales_item_kits
INNER JOIN phppos_sales FORCE INDEX (sales_search) ON phppos_sales_item_kits.sale_id=phppos_sales.sale_id
INNER JOIN phppos_item_kits ON phppos_sales_item_kits.item_kit_id=phppos_item_kits.item_kit_id
LEFT OUTER JOIN phppos_sales_item_kits_taxes ON phppos_sales_item_kits.sale_id=phppos_sales_item_kits_taxes.sale_id and phppos_sales_item_kits.item_kit_id=phppos_sales_item_kits_taxes.item_kit_id and phppos_sales_item_kits.line=phppos_sales_item_kits_taxes.line
WHERE sale_time BETWEEN "2014-03-01 00:00:00" and "2014-03-31 23:59:59" and phppos_sales.location_id='1' and phppos_sales.store_account_payment=0 GROUP BY sale_id, item_kit_id, line)
+----+--------------+------------------------------+--------+---------------------+--------------+---------+-----------------------------------------------------------------------------------------------------------+-------+----------------------------------------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+--------------+------------------------------+--------+---------------------+--------------+---------+-----------------------------------------------------------------------------------------------------------+-------+----------------------------------------------+
| 1 | PRIMARY | phppos_sales | range | sales_search | sales_search | 12 | NULL | 13098 | Using where; Using temporary; Using filesort |
| 1 | PRIMARY | phppos_sales_items | ref | PRIMARY,item_id | PRIMARY | 4 | pos.phppos_sales.sale_id | 1 | |
| 1 | PRIMARY | phppos_items | eq_ref | PRIMARY | PRIMARY | 4 | pos.phppos_sales_items.item_id | 1 | |
| 1 | PRIMARY | phppos_suppliers | ref | person_id | person_id | 4 | pos.phppos_items.supplier_id | 1 | Using index |
| 1 | PRIMARY | phppos_sales_items_taxes | ref | PRIMARY,item_id | PRIMARY | 12 | pos.phppos_sales.sale_id,pos.phppos_sales_items.item_id,pos.phppos_sales_items.line | 1 | |
| 2 | UNION | phppos_sales_item_kits | ALL | PRIMARY,item_kit_id | NULL | NULL | NULL | 1 | Using temporary; Using filesort |
| 2 | UNION | phppos_item_kits | eq_ref | PRIMARY | PRIMARY | 4 | pos.phppos_sales_item_kits.item_kit_id | 1 | |
| 2 | UNION | phppos_sales_item_kits_taxes | ref | PRIMARY,item_id | PRIMARY | 12 | pos.phppos_sales_item_kits.sale_id,pos.phppos_sales_item_kits.item_kit_id,pos.phppos_sales_item_kits.line | 1 | |
| 2 | UNION | phppos_sales | range | sales_search | sales_search | 12 | NULL | 13098 | Using where; Using join buffer |
| NULL | UNION RESULT | <union1,2> | ALL | NULL | NULL | NULL | NULL | NULL | |
+----+--------------+------------------------------+--------+---------------------+--------------+---------+-----------------------------------------------------------------------------------------------------------+-------+----------------------------------------------+
编辑：步骤C的新解释：
mysql> EXPLAIN (SELECT phppos_sales.deleted as deleted,phppos_sales.deleted_by as deleted_by, sale_time, date(sale_time) as sale_date, phppos_sales_items.sale_id, comment,payment_type, customer_id, employee_id, phppos_items.item_id, NULL as item_kit_id, supplier_id, quantity_purchased, item_cost_price, item_unit_price, category, discount_percent, (item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100) as subtotal, phppos_sales_items.line as line, serialnumber, phppos_sales_items.description as description, (item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100)+(item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) +(((item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) + (item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100)) *(SUM(CASE WHEN cumulative = 1 THEN percent ELSE 0 END))/100) as total, (item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) +(((item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) + (item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100)) *(SUM(CASE WHEN cumulative = 1 THEN percent ELSE 0 END))/100) as tax, (item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100) - (item_cost_price*quantity_purchased) as profit FROM phppos_sales INNER JOIN phppos_sales_items ON phppos_sales_items.sale_id=phppos_sales.sale_id INNER JOIN phppos_items ON phppos_sales_items.item_id=phppos_items.item_id LEFT OUTER JOIN phppos_suppliers ON phppos_items.supplier_id=phppos_suppliers.person_id LEFT OUTER JOIN phppos_sales_items_taxes ON phppos_sales_items.sale_id=phppos_sales_items_taxes.sale_id and phppos_sales_items.item_id=phppos_sales_items_taxes.item_id and phppos_sales_items.line=phppos_sales_items_taxes.line WHERE phppos_sales.sale_id between 103194 and 109743 and sale_time BETWEEN "2014-03-01 00:00:00" and "2014-03-31 23:59:59" GROUP BY sale_id, item_id, line) UNION ALL (SELECT phppos_sales.deleted as deleted,phppos_sales.deleted_by as deleted_by, sale_time, date(sale_time) as sale_date, phppos_sales_item_kits.sale_id, comment,payment_type, customer_id, employee_id, NULL as item_id, phppos_item_kits.item_kit_id, '' as supplier_id, quantity_purchased, item_kit_cost_price, item_kit_unit_price, category, discount_percent, (item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100) as subtotal, phppos_sales_item_kits.line as line, '' as serialnumber, phppos_sales_item_kits.description as description, (item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100)+(item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) +(((item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) + (item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100)) *(SUM(CASE WHEN cumulative = 1 THEN percent ELSE 0 END))/100) as total, (item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) +(((item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) + (item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100)) *(SUM(CASE WHEN cumulative = 1 THEN percent ELSE 0 END))/100) as tax, (item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100) - (item_kit_cost_price*quantity_purchased) as profit FROM phppos_sales INNER JOIN phppos_sales_item_kits ON phppos_sales_item_kits.sale_id=phppos_sales.sale_id INNER JOIN phppos_item_kits ON phppos_sales_item_kits.item_kit_id=phppos_item_kits.item_kit_id LEFT OUTER JOIN phppos_sales_item_kits_taxes ON phppos_sales_item_kits.sale_id=phppos_sales_item_kits_taxes.sale_id and phppos_sales_item_kits.item_kit_id=phppos_sales_item_kits_taxes.item_kit_id and phppos_sales_item_kits.line=phppos_sales_item_kits_taxes.line WHERE phppos_sales.sale_id between 103194 and 109743 AND sale_time BETWEEN "2014-03-01 00:00:00" and "2014-03-31 23:59:59" GROUP BY sale_id, item_kit_id, line);
+----+--------------+------------------------------+--------+---------------------+-------------+---------+-----------------------------------------------------------------------------------------------------------------------------------+-------+----------------------------------------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+--------------+------------------------------+--------+---------------------+-------------+---------+-----------------------------------------------------------------------------------------------------------------------------------+-------+----------------------------------------------+
| 1 | PRIMARY | phppos_sales | range | PRIMARY | PRIMARY | 4 | NULL | 12878 | Using where; Using temporary; Using filesort |
| 1 | PRIMARY | phppos_sales_items | ref | PRIMARY,item_id | PRIMARY | 4 | pos_compare.phppos_sales.sale_id | 1 | |
| 1 | PRIMARY | phppos_items | eq_ref | PRIMARY | PRIMARY | 4 | pos_compare.phppos_sales_items.item_id | 1 | |
| 1 | PRIMARY | phppos_suppliers | ref | person_id | person_id | 4 | pos_compare.phppos_items.supplier_id | 1 | Using index |
| 1 | PRIMARY | phppos_sales_items_taxes | ref | PRIMARY,item_id | PRIMARY | 12 | pos_compare.phppos_sales.sale_id,pos_compare.phppos_sales_items.item_id,pos_compare.phppos_sales_items.line | 1 | |
| 2 | UNION | phppos_item_kits | ALL | PRIMARY | NULL | NULL | NULL | 1 | Using temporary; Using filesort |
| 2 | UNION | phppos_sales_item_kits | ref | PRIMARY,item_kit_id | item_kit_id | 4 | pos_compare.phppos_item_kits.item_kit_id | 1 | Using where |
| 2 | UNION | phppos_sales_item_kits_taxes | ref | PRIMARY,item_id | PRIMARY | 12 | pos_compare.phppos_sales_item_kits.sale_id,pos_compare.phppos_sales_item_kits.item_kit_id,pos_compare.phppos_sales_item_kits.line | 1 | |
| 2 | UNION | phppos_sales | eq_ref | PRIMARY | PRIMARY | 4 | pos_compare.phppos_sales_item_kits.sale_id | 1 | Using where |
| NULL | UNION RESULT | <union1,2> | ALL | NULL | NULL | NULL | NULL | NULL | |
+----+--------------+------------------------------+--------+---------------------+-------------+---------+-----------------------------------------------------------------------------------------------------------------------------------+-------+----------------------------------------------+
10 rows in set (0.00 sec)
答案 0 :(得分：2)
索引phppos_sales无法正常工作，因为您在sale_id上请求汇总。
为了优化您的查询时间，这是我的建议（抱歉，由于我没有您的数据，我无法测试）：
一个。将您的密钥sales_search更改为：
KEY `sales_search` (`location_id`,`store_account_payment`,`sale_time`,`sale_id`)
（相等条件必须在范围条件之前..）
B中。计算并保存此请求的结果
SELECT MIN(sales_id) as min_id, MAX(sales_id) as max_id FROM phppos_sales
WHERE sale_time BETWEEN "2014-03-01 00:00:00" and "2014-03-31 23:59:59" and phppos_sales.location_id='1' and phppos_sales.store_account_payment=0
这应该使用sales_search。
℃。运行此请求
（将@min_id和@max_id替换为在步骤2中计算的值）
SELECT phppos_sales.deleted as deleted,phppos_sales.deleted_by as deleted_by, sale_time, date(sale_time) as sale_date, phppos_sales_items.sale_id, comment,payment_type, customer_id, employee_id, phppos_items.item_id, NULL as item_kit_id, supplier_id, quantity_purchased,
item_cost_price, item_unit_price, category, discount_percent,
(item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100) as subtotal,
phppos_sales_items.line as line, serialnumber, phppos_sales_items.description as description,
(item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100)+(item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) +(((item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) + (item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100)) *(SUM(CASE WHEN cumulative = 1 THEN percent ELSE 0 END))/100) as total,
(item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) +(((item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) + (item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100)) *(SUM(CASE WHEN cumulative = 1 THEN percent ELSE 0 END))/100) as tax,
(item_unit_price*quantity_purchased-item_unit_price*quantity_purchased*discount_percent/100) - (item_cost_price*quantity_purchased) as profit
FROM phppos_sales INNER JOIN phppos_sales_items ON phppos_sales_items.sale_id=phppos_sales.sale_id
INNER JOIN phppos_items ON phppos_sales_items.item_id=phppos_items.item_id
LEFT OUTER JOIN phppos_suppliers ON phppos_items.supplier_id=phppos_suppliers.person_id
LEFT OUTER JOIN phppos_sales_items_taxes ON phppos_sales_items.sale_id=phppos_sales_items_taxes.sale_id and phppos_sales_items.item_id=phppos_sales_items_taxes.item_id and phppos_sales_items.line=phppos_sales_items_taxes.line
WHERE sale_id between @min_id and @max_id sale_time BETWEEN "2014-03-01 00:00:00" and "2014-03-31 23:59:59" GROUP BY sale_id, item_id, line)
UNION ALL
(SELECT phppos_sales.deleted as deleted,phppos_sales.deleted_by as deleted_by, sale_time, date(sale_time) as sale_date, phppos_sales_item_kits.sale_id, comment,payment_type, customer_id, employee_id, NULL as item_id, phppos_item_kits.item_kit_id, '' as supplier_id, quantity_purchased, item_kit_cost_price, item_kit_unit_price, category, discount_percent,
(item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100) as subtotal,
phppos_sales_item_kits.line as line, '' as serialnumber, phppos_sales_item_kits.description as description, (item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100)+(item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) +(((item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) + (item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100)) *(SUM(CASE WHEN cumulative = 1 THEN percent ELSE 0 END))/100) as total,
(item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) +(((item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100)*(SUM(CASE WHEN cumulative != 1 THEN percent ELSE 0 END)/100) + (item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100)) *(SUM(CASE WHEN cumulative = 1 THEN percent ELSE 0 END))/100) as tax,
(item_kit_unit_price*quantity_purchased-item_kit_unit_price*quantity_purchased*discount_percent/100) - (item_kit_cost_price*quantity_purchased) as profit
FROM phppos_sales
INNER JOIN phppos_sales_item_kits ON phppos_sales_item_kits.sale_id=phppos_sales.sale_id
INNER JOIN phppos_item_kits ON phppos_sales_item_kits.item_kit_id=phppos_item_kits.item_kit_id
LEFT OUTER JOIN phppos_sales_item_kits_taxes ON phppos_sales_item_kits.sale_id=phppos_sales_item_kits_taxes.sale_id and phppos_sales_item_kits.item_kit_id=phppos_sales_item_kits_taxes.item_kit_id and phppos_sales_item_kits.line=phppos_sales_item_kits_taxes.line
WHERE sale_id between @min_id and @max_id AND sale_time BETWEEN "2014-03-01 00:00:00" and "2014-03-31 23:59:59"
GROUP BY sale_id, item_kit_id, line
请告诉我们它的表现。主键现在应该是计划程序的一个不错的选择，因为它按照“按组合规”的顺序排序，因此不需要文件排列。
好的，我在这里建议一个应该是“最佳案例”的请求，并为我们提供优化目标。你能告诉我们执行计划和执行时间吗？
(SELECT phppos_sales.sale_id, count(*) as nb_sales
FROM phppos_sales INNER JOIN phppos_sales_items ON phppos_sales_items.sale_id=phppos_sales.sale_id
INNER JOIN phppos_items ON phppos_sales_items.item_id=phppos_items.item_id
LEFT OUTER JOIN phppos_suppliers ON phppos_items.supplier_id=phppos_suppliers.person_id
LEFT OUTER JOIN phppos_sales_items_taxes ON phppos_sales_items.sale_id=phppos_sales_items_taxes.sale_id and phppos_sales_items.item_id=phppos_sales_items_taxes.item_id and phppos_sales_items.line=phppos_sales_items_taxes.line
WHERE sale_id between @min_id and @max_id sale_time BETWEEN "2014-03-01 00:00:00" and "2014-03-31 23:59:59" GROUP BY sale_id
)
UNION ALL
(
SELECT phppos_sales.sale_id, count(*)
FROM phppos_sales
INNER JOIN phppos_sales_item_kits ON phppos_sales_item_kits.sale_id=phppos_sales.sale_id
INNER JOIN phppos_item_kits ON phppos_sales_item_kits.item_kit_id=phppos_item_kits.item_kit_id
LEFT OUTER JOIN phppos_sales_item_kits_taxes ON phppos_sales_item_kits.sale_id=phppos_sales_item_kits_taxes.sale_id and phppos_sales_item_kits.item_kit_id=phppos_sales_item_kits_taxes.item_kit_id and phppos_sales_item_kits.line=phppos_sales_item_kits_taxes.line
WHERE sale_id between @min_id and @max_id AND sale_time BETWEEN "2014-03-01 00:00:00" and "2014-03-31 23:59:59"
GROUP BY sale_id )