sql server varchar max performance

The varchar (max), nvarchar (max), and varbinary (max) data types are added to SQL Server 2005. Shard data type (large-value data types) , Marked with the Max specifier. The

Label:Differences between text and varchar (max) data types in SQL ServerIt was only known that text and image were data types that could be retired by SQL Server, but it was not clear why the difference between text and varchar (

Differences between text and varchar (max) data types in SQL ServerIt was only known that text and image were data types that could be retired by SQL Server, but it was not clear why the difference between text and varchar (

In Ms sql2005 and later versions, the sequence data types (varchar (max), nvarchar (max), and varbinary (max) are added )). The Bytes data type can store up to 2 ^ 30-1 bytes of data. These data types are behavior and small data types.Varchar,NvarcharAndVarbinarySame. Microsoft uses this data type to replace the prev

In Ms sql2005 and later versions, the sequence data types (varchar (max), nvarchar (max), and varbinary (max) are added )). The Bytes data type can store up to 2 ^ 30-1 bytes of data. These data types are behavior and small data types.Varchar,NvarcharAndVarbinarySame. Microsoft uses this data type to replace the prev

from being cracked by malicious attacks. It has no effect on space and performance. N setting is better:Since there is no impact on space and performance, we only need to consider the business needs. I have analyzed Microsoft databases, most of which are set to 256. We will also see 64,128,512, max, etc, it may be easy to remember. Examples of

could be retired by SQL Server, but it was not clear why the difference between text and varchar (max) and nvarchar (max) was found in reading today, mainly the restriction of operators. Text can only be used by the following functions: function Statemen

Differences between varchar and nvarchar: Varchar (n)Variable-length and non-Unicode character data with a length of n Bytes. N must be a value between 1 and 8,000. The storage size is the actual length of the input data bytes, rather than n Bytes (such as varchar (6). When the field is qqq, the actual space occupied by the database is 3 bytes, instead of 6 bytes

In SQL Server, when we set character fields, there are often a number of data types for us to choose from, such as: char nchar varchar nvarchar, then we should choose which one? Here's a Yi Yilai description of the difference. char: fixed length, non-Unicode character data, n bytes in length. The value range of n is 1 to 8,000, and the storage size is n bytes. T

In SQL Server, when we set character fields, there are often many data types for us to choose from, such as char nchar varchar nvarchar. Which one should we choose? The differences are described one by one. Char:Fixed Length, non-Unicode character data, length is n Bytes. The value range of n is 1 to 8,000, and the storage size is n Bytes. The synonym for SQL2003

Differences between varchar and nvarchar: Varchar (N)Variable-length and non-UNICODE character data with a length of n Bytes. N must be a value between 1 and 8,000. The storage size is the actual length of the input data bytes, rather than n Bytes (such as varchar (6). When the field is qqq, the actual space occupied by the database is 3 bytes, instead of 6 byt

commonly used character data type.(7) SupplementTEXT Text stores non-Unicode data of variable length, with a maximum length of 2^31-1 (2,147,483,647) characters.NCHAR, NVARCHAR, NTEXTThese three kinds of names from the first three more than the previous "N". Compared to char and varchar, nchar and nvarchar store up to 4,000 characters, whether in English or Chinese characters, while char and varchar can st

Differences between varchar and nvarchar: Varchar (N)Variable-length and non-UNICODE character data with a length of n Bytes. N must be a value between 1 and 8,000. The storage size is the actual length of the input data bytes, rather than n Bytes (such as varchar (6). When the field is qqq, the actual space occupied by the database is 3 bytes, instead of 6 byte

In SQL, the varchar type is converted to int and then sorted, if our database ID is set to varchar type, the order by ID when queried.If the ID of our database is set to the varchar type of the order by ID at the time of the query, we do not want to see the following situation.We can convert

In industrial control applications, the returned data is often stored in binary format, and the binary data represents a hexadecimal data content every 4 bits. During parsing, a single byte usually occupies eight digits (BIT). 4 bits at the top indicate a hexadecimal data, and 4 bits at the bottom indicate a hexadecimal data. Problem description: In the SQL Server database, how does one directly conv

for Chinese and other characters, where n represents a Unicode constant, which resolves the problem of conversion between multilingual character sets. The following are supplementary: For fields with generic string types in your program, there are four types of char, varchar, nchar, and nvarchar in SQL Server, so what's the difference between these four types

nvarchar, Then the Chinese character is also nvarchar (1), the letter is also nvarchar (1), then already very obvious.at the same time, varchar retrieval is faster than nvarchar. varchar uses a single byte to store data in SQL Server, and nvarchar uses Unico to store data.Chinese characters stored in

variable length.Vi. How do I use these types?If you are sure of the length of the stored data and do not pack in Chinese, you can choose the char type. If you are sure of the stored data length, but may include Chinese, you can choose the nchar type. If you are unsure of the length of the stored data, store only English, the best use of the number varchar If you are unsure of the length of the stored data, it is possible to have Chinese, you can choo

Select CONVERT (varchar), GETDATE (), 20040912 Select CONVERT (varchar (), GETDATE (), 102) 2004.09.12 Select CONVERT (varchar), GETDATE (), 101 ) 09/12/2004 Select CONVERT (varchar (104), GETDATE (), 103) 12/09/2004 Select CONVERT (varchar), GETDATE (),) 12.09.2004 S

, without the efficiency of a varchar high. (4) Why use nvarchar? with n prefixes, n denotes Unicode characters, that is, all characters account for two bytes, Nchar,nvarchar Character, the English characters only need one byte storage is sufficient, but the Chinese character is numerous, requires two bytes of storage, English and Chinese characters are prone to confusion, the Unicode character set is to solve the problem of incompatible character set