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The following articles mainly introduce how to use MySQL built-in functions to convert IP addresses and related numbers. In actual operations, when processing character formats, such as converting 54789, we only need to use: format (12345, 0). The following describes the specific content. Use MySQL built-in functions to conve
--separate multiple rows of records (only one column) with the specified delimiterIF(object_id('Sp_rowschangeclosbysplit'N'P') is not NULL) DROP PROCSp_rowschangeclosbysplitGOCREATE PROCSp_rowschangeclosbysplit@table nvarchar( -),--Table name@field nvarchar( -),--fields to stitch@split varchar(Ten)=',',--Separators@where nvarchar( -)="' --conditions asBEGIN DECLARE @sql NVARCHAR( +)SET @sql='Select TOP 1 Stuff ((select" "+@split+" "+convert (va
In mysql, if I use common data sorting methods, we may not get the expected results, but mysql provides us with the CAST CONVERT function, which can CONVERT numbers accordingly, I used this function to sort Chinese characters in the past.
Let's briefly introduce the varchar Sorting Problem of
The following articles mainly introduce how to use MySQL built-in functions to convert IP addresses and related numbers. In actual operations, when processing character formats, such as converting 54789, we only need to use: format (12345, 0). The following describes the specific content.
Use MySQL built-in functions to conve
In mysql, we often use the CONVERT () function to format the time and date of the CONVERT type. below I will introduce you to the usage of the CONVERT () function in detail, for your reference.
In mysql, we often use the CONVERT (
Convert the suffix. frm,. myd, and myi into. SQL and import it to the mysql database. frmmyi
Use a local MySQL database to convert these files to. SQL scripts.
1. Install MySQL. The version and font must be the same as that on the server. Otherwise, garbled characters are di
explain how I changed the field type, you are interested in searching my previous log. (Cheat click)
Description of the phenomenon:
Below, I from the database in order to server_id, we look at the sort of results:
The code is as follows
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Select server_id from cardserver where game_id = 1 order BY server_id DESC limit 10;+-----------+| server_id |+-----------+| 8 || 7 || 6 || 5 || 4 || 3 || 2 || 10 || 1 |+-----------+
Obviously, I want the result
First Reader Network reference
The code is as follows
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CONVERT (expr USING transcoding_name)
In MySQL, transcoding names are the same as the corresponding character set names.
Examples:
The code is as follows
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SELECT CONVERT (_latin1 ' Müller ' USING UTF8);INSERT into utf8table
Group_concat () is a function provided by the MySQL database. It is usually used together with group by. For details, refer to the MySQL official document: commit.
Syntax:
Group_concat ([distinct] expr [, expr...] [order by {unsigned_integer | col_name | expr} [ASC | DESC] [, col_name...] [separator str_val])1. For example:Select student_id, group_concat (courses_id) as courses from student_courses wher
First, the CONVERT functionCharacter Set conversions: convert (XXX USING gb2312) type conversions are the same as SQL Server, but differ on type parameters: CAST (xxx as type), convert (XXX, type), type must be of the following type:Available type binary with binary prefix effect: binary character type, parameter: CHAR () Date: Date Time: Time datetime type: DATE
Mysql varchar sorting CAST, CONVERT function type conversion, varcharconvert
When creating a table on your own, you should create a field type as varchar (2). In fact, it should be set as integer (2). But today, we found a Sorting Problem in the background and a varchar Sorting Problem, so how can this problem be solved?
Example Table Structure: Let's take a look, my table structure show create table cards
MySQL 5.1 Upgrade compile install 5.6 Convert the original MyISAM table to InnoDB and back up the global one at a time1."Backup specified database" Do not use commas mydb hellodb[Email protected] ~]# mysqldump-uroot-p--databases mydb hellodb >/tmp/all.sql"Modify Engine=myisam to Engine=innodb"[[email protected] home]# CP hellodb.sql hellodb.sql.bak[[email protected] home]# vim hellodb.sql:%s/engine=myisam/
Tags: mysql myisam innodb1.BACKUP database: Mysqldump-u[user]-p[password] [databasename] > [dbfile.sql] # Back up the database. 2./usr/local/mysql/bin/mysqladmin-u root-p Shutdown #Stop the database orservice MySQL stop. 3. InnoDBThe table does not support full-text search, so remember to fulltext the backed-up database SQL and delete the index about fulltext. 4.
Tags: http color ar div code SP on time lineMySQL's cast () and CONVERT () functions can be used to get a value of one type and produce a value of another type. The specific syntax for both is as follows:
1
CAST(valueastype);
2
CONVERT(value, type);
is cast (xxx as type), CONVERT (XXX, type).There i
Tags: style http color ar sp div on code timeMySQL's cast () and CONVERT () functions can be used to get a value of one type and produce a value of another type. The specific syntax for both is as follows:View Source print?
1
CAST(value astype);
2
CONVERT(value, type);
is cast (xxx as type), CONVERT
How to use MySQL functions to convert IP addresses and numbers
Use MySQL built-in functions to convert IP addresses and numbers
Using two built-in functions
Inet_aton: converts an IP address to a number.
Inet_ntoa: convert a numeric type to an IP address
Make full u
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