Mysql Concat

First, the importance of the index The index is used to quickly find a column in a particular value of the line. Instead of using an index, MySQL must start with the first record and then read the entire table until it finds the relevant row. The larger the table, the more time it takes. If the table in the query column index, MySQL can quickly reach a location to search the middle of the data file, there is no need to see all the data. Note that if you need to access most of the rows, sequential reads are much faster since we avoid disk searches. If you use Xinhua Dictionary to find "Zhang" the Chinese characters, do not use the directory, then ...

CREURN DEFINER = `root` @` localhost` FUNCTION `UF_Get_tMaxCode` (V_iType INT) RETURNS varchar (10) CHARSET utf8 BEGIN / * Description of business: Generate encoding based on encoding category Input Parameters: V_iType :coding...

The Ltrim,rtrim function is provided in MySQL to remove the first Mao of the character so if I want to delete the word Furu "ABC Fdsa" How To do it, let's look at the tutorials LTrim the function code below mysql> Select Concat ('. ', LTrim   (' DDD '), '. '); RTrim function code as follows Mysql> sel ...

Current Dream Dedecms v5.7 has been officially released, but in the actual use of the environment often we need to do some specific function of the implementation, such as the letter search, and so on, let us say how the function is implemented, the main method is to extract the first letter of the publication resources, stored in the datasheet, and then indexed. Dedecms based on PHP and MySQL technology development, can be used at the same time in Windows, Linux, UNIX platform, the environment needs are as follows: 1, Windows Platform: ...

Construction of enterprise security building open source SIEM platform. SIEM (security information and event management), as its name implies, is a management system for security information and events. It is not a cheap security system for most enterprises. This article uses the author's experience to introduce how to use open source software to analyze data offline and use attack modeling Way to identify attacks. Review the system architecture to the database, for example, through logstash to collect mysql query log, near real-time backup ...