mysql order by case

PrefaceIn addition to the regular join statements, there is a class of query statements that are also used more frequently, that is, orderby,group by and distinct. Considering that all three types of queries involve the sorting of data, I put them

The MySQL order BY keyword is used to classify the data in the record. MySQL ORDER BY keyword classified by keyword The ORDER BY keyword is used to classify the data in a record. MySQL ORDER BY syntax The code is as follows Copy

In some cases, MySQL can use an index to satisfy the order by clause without additional sorting. The where condition and order by condition use the same index, and the order by order is the same as the index order, and the order by field is both

The main purpose of this article is to demonstrate how LookMySQL joins. by "look at" I mean how to see through MySQL's eyes, so-to-speak. this task is fundamentally different from the rather straight-forward tasks of how to do joins or how to index

MySQL Order By Principle and Optimization 1 IntroductionFor business (MySQL) DBAs or business developers, order by is a common business function that sorts the results based on specified fields to meet front-end display requirements. However,

Desc SELECT ActionId, UserID, CreateUser, ActionType, ActionName, Actioncomment, CreateDate, Pointsrulesid,reason, Objectid,byuserid,byusername,subjectid from Wikiuseractionlog Where createdate> ' 0001-01-01 00:00:00 ' and ActionType in (10,9,19,20)

Henan College of Traditional Chinese Medicine Course Design Report of MySQL Database Management  Title: Research and Implementation of MySQL Clusters       Completion date:2012January 1, December 31   Contents 1. Course Design overview 3 2. research

MySQL order by performance optimization example This article mainly introduces the MySQL order by performance optimization method example. This article explains the principle of order by in MySQL and the three methods to optimize order by. For more

Let's just look at the example. Try it by yourself Mysql> select * From tb_clothes; + ---- + -------- + ------- + ------------ + --------- + | ID | Name | price | Total | date | Address | + ---- + -------- + ------- + ------------ + --------- + | 1

MySQL data recovery case after truncate misoperation, mysqltruncate The actual online scenario is complicated. At that time, the truncate and delete operations were involved. It was confirmed that more than 70 thousand rows of data were lost. when