sql compare varchar

its characters are expressed in two bytes, That is, the English character is also represented in two bytes. the length of the nchar and nvarchar is between 1 and 4000. 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 store up to 8,000 English and 4,000 Chinese characters. It can be seen that the use of nchar,

Description and comparison of database storage types (nchar, char, nvarchar, varchar) for database SQL Server1.char Type:The English (ASCII) characters occupy 1 bytes, a Chinese character occupies 2 bytes, char is convenient to store the fixed length data, the index on the Char field is very efficient, such as the definition of char (10), then regardless of whether the data you stored is 10 bytes, it takes

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 of char is character. Varchar:Variable Lengt

, 8UNION SELECT 5, 8UNION SELECT 6, 9UNION SELECT 7, 10UNION SELECT 8, 8UNION SELECT 9, 26UNION SELECT 10, 8UNION SELECT 11, 8UNION SELECT 12, 6UNION SELECT 13, 24UNION SELECT 14, 12UNION SELECT 20, 19UNION SELECT 21, 23UNION SELECT 22, 20UNION SELECT 23, 10UNION SELECT 24, 8UNION SELECT 25, 23UNION SELECT 100, 19UNION SELECT 101, 10UNION SELECT 102, 10UNION SELECT 103, 10UNION SELECT 104, 10UNION SELECT 105, 10UNION SELECT 106, 11UNION SELECT 107, 12UNION SELECT 108, 8UNION SELECT 109, 26UNION

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 varchar (max), nvarchar (max), and varbinary (max) data types correspond to SQL Server 2000 and earlier versions of

This article introduces the differences between charncharvarcharnvarchartextntext of character data fields in SQL. This article introduces the differences between char, nchar, varchar, nvarchar, text, and ntext of character data fields in SQL. When you enter a certain field, you only need to enter seven numbers for the item number field. When you select a data

The difference between char, varchar, and nvarchar in SQL in the difference between char, varchar, nvarchar char Char is fixed-length, that is, when you enter a character that is less than the number you specify, char (8), the character you enter is less than 8 o'clock, and it will fill the empty value back. When you enter a character that is larger than th

SQL: the primary key of a data table is of the varchar type and does not increase itself. how can I insert a primary key when inserting data? SQL: the primary key of a data table is of the varchar type and does not increase itself. how can I insert a primary key when inserting data? Reply content:

Q: What is the difference between varchar and nvarchar in SQL Server? varchar seems to be an English character and a Chinese character both stand in two bytes, while nvarchar is an English character and a Chinese character occupies two bytes. However, this ProgramWhat is the impact? A: Varchar (N) Variable-length

Ask: What is the difference between varchar and nvarchar in SQL Server, varchar seems to be an English and a Chinese character is standing two bytes, while nvarchar is an English account of a byte, Chinese characters accounted for two bytes. But what effect does this have on the ASP program? For: VARCHAR (n) A variable

SELECT CONVERT (varchar), CAST (@testFloat as Decimal (38,2))SELECT STR (@testFloat, 38, 2) Importing from Excel to sql2000, there is a list of "contacts" that have become float types, and I want to convert to nvarchar type, using the following statement Select convert (nvarchar), convert (int, contact) from employeeGo Data overflow, no! Select convert (nvarchar), CONVERT (Decimal (11,0), contact) from employeeGo Data Conversion Successful! SELE

according to the actual situation. Ncahr, nvarchar, ntext. These three kinds of names from the first three more than the previous "N". It represents a character stored in a Unicode data type. We know that characters, the English character only need a byte storage is enough, but the number of Chinese characters, need two bytes of storage, English and Chinese characters at the same time prone to confusion, the Unicode character set is to solve the character set this incompatibility problem, a

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 choose the nvarchar type, a

digital, with Char/varchar char,nchar fixed length, fast, occupy space, need to deal withVarchar,nvarchar,text variable length, small space, slow speed, no need to handleNCHAR, NVARCHAR, ntext processing Unicode codes CHAR (n) Fixed length High index Efficiency program use trim to remove extraneous blanks n must be a numeric value between 1 and 8,000, with a storage size of n bytes

For general string fields in the program, SQL Server has char, varchar, nchar, and nvarchar types. What are the differences between these four types? Here we will make a comparison. 1. Fixed Length or variable length The so-called fixed length is fixed length. when the length of the data to be saved is insufficient, an English space will be automatically filled behind it to make the length reach the corresp

For general string fields in the program, SQL Server has char, varchar, nchar, and nvarchar types. What are the differences between these four types? Here we will make a comparison. 1. Fixed Length or variable length The so-called fixed length is fixed length. when the length of the data to be saved is insufficient, an English space will be automatically filled behind it to make the length reach the corresp

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? 1. Fixed-length or variable-length The so-called fixed-length is long, when the length of the data to be saved will automatically fill in the back of the English space, so that the length of the corresponding length; there is the

VARCHAR (n)Variable-length, non-Unicode character data with a length of n bytes. n must be a numeric value between 1 and 8,000. Storage size is the actual length of bytes of input data, not n bytes.nvarchar (n)A variable-length Unicode character data that contains n characters. The value of n must be between 1 and 4,000. The storage size of bytes is twice times the number of characters entered.Two fields have field values: me and coffee.The

Differences between char, varchar, text, nchar, nvarchar, and ntext in SQL 1. Char. It is very convenient for Char to store fixed-length data, and the indexing efficiency of char fields is high. For example, if char (10) is defined, no matter whether the data you store reaches 10 bytes, it takes up 10 bytes of space. 2. varchar. Variable-length data is stored,

In SQL, convert the varchar type to the int type and then sort it. If the database ID is set to the orderbyid OF THE varchar type during query In SQL, convert the varchar type to the int type and then sort it. If the database ID is set to the order by id of the