In addition to Weibo, there is also WeChat
Please pay attention
WeChat public account
Shulou
2025-09-23 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Development >
Share
Shulou(Shulou.com)06/03 Report--
This article introduces the relevant knowledge of "how to solve mysql group by problem". In the operation process of actual cases, many people will encounter such difficulties. Next, let Xiaobian lead you to learn how to deal with these situations! I hope you can read carefully and learn something!
The data tables are as follows:
Demand counts who has the highest wages in each department.
sql select NAME,desp, MAX(price) from show_plan GROUP BY desp
name , desp are the first data...
Correct statement: Use temporary tables. The first time, sort by price desc.
drop TABLE tmp3 ;
CREATE TABLE tmp3 (SELECT * from show_plan ORDER BY price DESC ) ;
SELECT * from tmp3 GROUP BY desp
It is strange that the sql result below is incorrect.
SELECT * from (SELECT * from show_plan ORDER BY price DESC) b GROUP BY b.desp
The result of the implementation of Article 1 is the same...
With the table statement, the judge can test it by himself.
DROP TABLE IF EXISTS `show_plan`;
CREATE TABLE `show_plan` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`name` char(4) NOT NULL,
`desp` int(11) NOT NULL,
`price` int(11) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB ;
INSERT INTO `show_plan` VALUES ('1', 'a1', '1', '55');
INSERT INTO `show_plan` VALUES ('2', 'a2', '1', '20');
INSERT INTO `show_plan` VALUES ('3', 'a3', '1', '63');
INSERT INTO `show_plan` VALUES ('4', 'a4', '2', '89');
INSERT INTO `show_plan` VALUES ('5', 'a5', '2', '78');
INSERT INTO `show_plan` VALUES ('6', 'a6', '2', '90');
INSERT INTO `show_plan` VALUES ('7', 'a7', '3', '88');
INSERT INTO `show_plan` VALUES ('8', 'a8', '3', '77');
INSERT INTO `show_plan` VALUES ('9', 'a9', '3', '100');
INSERT INTO `show_plan` VALUES ('10', 'a10', '1', '77');
INSERT INTO `show_plan` VALUES ('11', 'a11', '4', '75');
"How to solve mysql group by problem" content is introduced here, thank you for reading. If you want to know more about industry-related knowledge, you can pay attention to the website. Xiaobian will output more high-quality practical articles for everyone!
Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.
Views: 0
*The comments in the above article only represent the author's personal views and do not represent the views and positions of this website. If you have more insights, please feel free to contribute and share.
The market share of Chrome browser on the desktop has exceeded 70%, and users are complaining about
The world's first 2nm mobile chip: Samsung Exynos 2600 is ready for mass production.According to a r
A US federal judge has ruled that Google can keep its Chrome browser, but it will be prohibited from
Continue with the installation of the previous hadoop.First, install zookooper1. Decompress zookoope
About us Contact us Product review car news thenatureplanet
More Form oMedia: AutoTimes. Bestcoffee. SL News. Jarebook. Coffee Hunters. Sundaily. Modezone. NNB. Coffee. Game News. FrontStreet. GGAMEN
© 2024 shulou.com SLNews company. All rights reserved.