if else condition in mysql

The great god says: In sql, you can use if else without casebelow to see, specifically why, did not figure out if there is a great God to know to provide the following information:MySQL can be used as an expression, or as a Process control statement

MySQL常用指令，java，php程序员，数据库工程师必备。程序员小冰常用资料整理MySQL common commands (for reference)The most common display commands are:1. Display the list of databases.show databases;2. Display the data table in the library:Use MySQL;Show tables;3, display the

The following articles mainly describe the practical application of MySQL conditional selectcase. This article does not closely introduce the actual application code example, it also lists the items worth your attention in the actual operation of

Where Condition Query The code is as follows SELECT * FROM news where DATE (adddate) between ' 2011-04-20 '-INTERVAL 5 day and ' 2011-04-20 ' + INTERVAL 5 day SELECT * FROM news where DATE (adddate) in (' 2011-04-20 ', ' 2011-04-15 ', ' 2011-04-2

Concrete Example 1. PHP Server ComponentsFor beginners, it is recommended to use the integrated server component, which already includes PHP, Apache, Mysql and other services, eliminating the time spent by developers in the tedious configuration

The data SQL CASE expression is a generic conditional expression that resembles a if/else statement in another language.Case if condition then resultWhen condition then result.............[When ...][ELSE result]ENDThe case clause can be used where

Where Condition Query The code is as follows Copy Code SELECT * FROM news where DATE (adddate) between' 2011-04-20 '-INTERVAL 5 day and ' 2011-04-20 ' + INTERVAL 5 daySELECT * FROM news where DATE (adddate) in (' 2011-04-

Case has two formats. Simple case function and case search function.--Simple Case functionCase SexWhen ' 1 ' Then ' men 'When ' 2 ' then ' women 'Else ' other ' END--case search functioncase If sex = ' 1 ' Then ' man 'When sex = ' 2 ' Then ' women

Case has two formats. Simple case function and case search function.--Simple Case functionCase SexWhen ' 1 ' Then ' men 'When ' 2 ' then ' women 'Else ' other ' END--case search functioncase If sex = ' 1 ' Then ' man 'When sex = ' 2 ' Then ' women

18.2.1 MySQL server has gone away errors related to Lost connection to server during query. The most common cause of the MySQL server has gone away error is that the server times out and closes the connection. By default, if nothing happens, the