MySQL查询确实慢于加载基准

Question

此MySQL查询在某些WHERE和HAVING条件下正在经历非常缓慢的加载基准：

  SELECT * FROM test p 
  WHERE p.brandid=636  
    AND DATEDIFF(p.registration, '2019-01-01') >= 0 
    AND DATEDIFF(p.registration, '2019-05-22') <= 0  
  GROUP BY p.invoice_num 
  HAVING (p.net_amount BETWEEN 0 AND 1000) 
    AND (p.profit_amount BETWEEN 0 AND 1000) 
    AND (p.cost_amount BETWEEN 0 AND 1000) 
  ORDER BY p.registration DESC LIMIT 100 OFFSET 0

在CREATE STMT下面：

CREATE TABLE `test` (
  `id` bigint(11) NOT NULL AUTO_INCREMENT,
  `original_id` bigint(11) DEFAULT NULL,
  `invoice_num` bigint(11) NOT NULL,
  `registration` timestamp NULL DEFAULT NULL,
  `paid_amount` decimal(10,6) DEFAULT NULL,
  `cost_amount` decimal(10,6) DEFAULT NULL,
  `profit_amount` decimal(10,6) DEFAULT NULL,
  `net_amount` decimal(10,6) DEFAULT NULL,
  `customer_id` bigint(11) DEFAULT NULL,
  `recipient_id` text,
  `cashier_name` text,
  `sales_type` text,
  `sales_status` text,
  `sales_location` text,
  `invoice_duration` text,
  `store_id` double DEFAULT NULL,
  `is_cash` int(11) DEFAULT NULL,
  `is_card` int(11) DEFAULT NULL,
  `brandid` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`,`invoice_num`),
  KEY `idx_registration_compound` (`id`,`registration`),
  KEY `invoiceNum_idx` (`invoice_num`)
) ENGINE=InnoDB AUTO_INCREMENT=47420958 DEFAULT CHARSET=latin1;

我在id和registration字段之间添加了复合索引。但是我认为我可以通过更正确地结合索引来改进它。

以下说明：

TIMEDIFF（）是否对性能有影响？ 关于如何提高基准的任何想法？

Answer 1

您的where子句涉及列brandid（p.brandid = 636）和p.registration（DATEDIFF（p.registration，'2019-01-01'）），因此请尝试在

上添加一个复合索引

table  test  columns  ( brandid, registration) 

Answer 2

根据建议，使用（品牌标识，注册）和

尝试将力索引与新创建的复合索引一起使用

从逻辑上讲，您的查询可以重组为

SELECT * FROM test p force index (index_name)
  WHERE p.brandid=636  
    AND p.registration between  '2019-01-01' and '2019-05-22'
  GROUP BY p.invoice_num 
  HAVING (p.net_amount BETWEEN 0 AND 1000) 
    AND (p.profit_amount BETWEEN 0 AND 1000) 
    AND (p.cost_amount BETWEEN 0 AND 1000) 
  ORDER BY p.registration DESC LIMIT 100 OFFSET 0

尝试运行此命令并共享解释结果集