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Tags: style blog http color using AR data SP logToday in the task of making a input string length check on the page, the database defines the field as the title varchar (+) NULL, MySQL database.Always thought that 128 is a byte length, a Chinese character 2 bytes, English and so on a byte, so can only put up to 64 char
Label:What is the maximum length of int (11), and what is the maximum length of varchar in MySQL? What is the maximum length of int (11)? In the SQL statement, int represents the type of field you want to create, int represents an integer, and 11 represents the
Label: if the setting in an item is varchar ( So, of course, the English is So what about Chinese? Utf-8 in Chinese is 3 bytes So, does this varchar (50) have only 16 characters to save? No, this is the case with MySQL, but not after 5.0. MySQL varchar (50) Both Chinese and
How to explain N in varchar (N) and nvarchar (n: Nvarchar (n) can store up to nCharacter, Does not distinguish between Chinese and English. Varchar (n) can store up to n Bytes, A Chinese character is two bytes. Space occupied:A single nvarchar (n) character occupies two bytes.Varchar (n) occupies two bytes of Chinese, and English occupies one. Value range of N:Nvarchar (n) n ranges from 1 to 4000.
The performance impact of MySQL type varchar (20) and varchar (255)1.If the index size is not limited when MySQL creates an index, the index length will use the length of this field by
MySQL study NOTE _ summary of MySQL character type VARCHAR length knowledge bitsCN.com MySQL study NOTE _ summary of MySQL character type VARCHAR l
for the database to choose the appropriate data type storage, which has a certain impact on performance. Here in the fragmentary record two pens, for type int, if you do not need to access negative values, it is best to add unsigned; For fields that often appear in the Where statement, consider indexing, which is especially appropriate for indexing. The above is a small series to introduce the MySQL
MySQL uses the type varchar (20) and varchar (255) to affect the performance, mysqlvarchar1.If the index size is not limited when MySQL creates an index, the index length will use the length
In MySQL, what is the maximum length of the varchar type? We will find that the varchar length is 65535 for the varchar data type, that is, 65532 bytes of data can be stored, is that true? Let's take a look. 1. Restrictions Field
1. Restriction rules The limits of a field have the following rules when the field is defined: A) storage limits The varchar field is to store the actual content separately from the clustered index, where the content begins with 1 to 2 bytes representing the actual length (2 bytes in length over 255), so the maximum leng
varchar (n), n in nvarchar (n) how to interpret:nvarchar (n) can store up to n characters without distinguishing between Chinese and English. varchar (n) can store up to n bytes , and one Chinese is two bytes.Occupied space:nvarchar (n) is a character that takes up two bytes of space.varchar (n) Chinese accounts for two bytes of space in English.Value range of N:The range of nvarchar (n) n is: between 1 an
MySQL study note _ Summary of MySQL character type VARCHAR length I. VARCHAR storage and row length restrictions1. in VARCHAR (N), N refers to the
The length of the mysql varchar field bitsCN.com Length of the varchar field of mysql When designing system fields today, I found myself not familiar with varchar. I have set a field.
The maximum length of MySQL varchar is always regarded as two bytes to record the length (the length can also be recorded in one byte ), this problem was boring at the time, but some people in the group explained it and suddenly found that it was not that simple. In
An interesting question: the maximum length of varchar in MySQL is bitsCN.com. An interesting question: the maximum length of varchar in MySQL The minimum heap of 1 K is obviously maintained, but only nine hundred rows of data
This article introduces the character length and related parameters of the varchar data type in mysql. For more information, see this article. This article introduces the character length and related parameters of the varchar data type in
In mysql, if varchar length is set to 50 in one item, then of course 50 in English, then in Chinese, UTF-8 occupies three bytes in Chinese, can this varchar (50) only store 16 Chinese characters? Mysql varchar (50) stores 50 file
About the maximum length of varchar in MySQL bitsCN.com I was asked a question: What is the maximum varchar length in MySQL? This is not a fixed number. This article briefly describes the restrictions. 1. restrictions on rule fiel
What is the maximum varchar length in MySQL? This is not a fixed number. Briefly describe the restriction rules. When defining a field, there are the following rules: a) Storage restrictions varchar? The field stores the actual content separately in the clustered index. The content starts with 1 to 2 bytes to indicate
Http://dinglin.iteye.com/blog/914276 Http://www.cnblogs.com/fakis/archive/2011/03/07/1976532.htmlIf varchar (50) is set in one item, then of course 50 for English, then for Chinese, the UTF-8 Chinese occupies 3 bytes, then the varchar (50) can I only store 16 Chinese characters? This is not the case. MySQL earlier than MySQL
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