mysql if expression

2.4 Expression evaluation and type conversionMySQL allows you to write expressions that include constants, function calls, and table-column references. These values can be grouped using different types of operators, such as arithmetic or comparison

Before starting this topic, we should first conduct a small experiment to compare the high efficiency of REGEXP and Like. If the efficiency is too low, we do not need to do too much research, the experiment code is as follows:Require ("config. php ")

Appendix G: MySQL Regular Expression Regular Expressions are a powerful way to specify patterns for complex searches. MySQL adopts the Regular Expression of Henry Spencer, and its goal is to comply with POSIX 1003.2. See Appendix C: Thank you.

Apache + Mysql + PHP reproduced from: http://blog.csdn.net/buutterfly/article/details/5630203 DedeCMS deployment -- how to deploy Apache + Mysql + PHP (LAMP )?1. Linux OS: Linux OS: Red Hat Enterprise Linux AS release 4 (Nahant Update 6) 2.

Regular Expressions are a powerful way to specify patterns for complex searches. MySQL adopts the Regular Expression of Henry Spencer, and its goal is to comply with POSIX 1003.2. SeeAppendix C: Thank you. MySQL adopts an extended version to support

Reprinted from: http://blog.csdn.net/buutterfly/article/details/5630203 DEDECMS deployment-How to deploy apache+mysql+php (LAMP)?1. Linux OS: Linux os:red Hat Enterprise Linux as Release 4 (Nahant Update 6) 2.Deploy Apache 2.1 Download

Pattern matching for MySQL WHERE clauseToday in the application of this problem encountered,There is a field T1, where the value is similar to: 1,1,1,2,3,3,4,4,5,5,2,4,3,2,1,2Need to search from inside for example: the first comma before the number

Regular expressions (regex) are a powerful tool for defining complex queries. Here is a simple document, which ignores some detailed information. A regular expression defines a string rule. The simplest regular expression does not contain any

Mysql regular expressions I personally think that the regular expressions in other program scripts are not much different in usage and rules. Next I will summarize some of the mysql Regular Expressions and instance methods. "." Matches any single

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