sql compare varchar

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 convert binary data to string data? Someone wil

varchar uses a single byte to store data in SQL Server, and nvarchar uses Unico to store data. Chinese characters stored in SQL Server are saved as two bytes (typically with Unico encoding), English characters are saved to the database, and if the field's type is varchar, only one byte is consumed, and two bytes if th

Today encountered a mistake like this, the specific error situation is as followsThe solution is as follows.Database MSSQL When comparing the size, error prompt: "The varchar value ' 24.5 ' is converted to a column of the data type int" syntax error occurs! "The type of the Analysis database design column is varchar, and the above error is reported when the search comparison statement executes the" SELECT *

Differences between char, varchar, text, nchar, nvarchar, and ntext in SQL I have encountered this problem before, but I don't know the system. I happened to ask this question a few days ago. I checked the information and summarized it. 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 wheth

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

, 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

cursorSelectSQL= 'Alter table ['+ D. Name+ '] Alter column [' + A. Name + '] N'+ B. Name + '(' + Cast (A. length * 2 as varchar) + ')'From syscolumnsLeft join policypes B on A. xtype = B. xusertypeInner join sysobjects D on A. ID = D. id and D. xtype = 'U' and D. Name WhereB. Name in ('Char', 'Varchar ')AndNot exists (select 1 from sysobjects where xtype = 'pk' and name in (Select name from sysindexes wher

Varchar uses a single byte to store data in SQL Server. nvarchar uses Unico to store data. when a Chinese character is stored in SQL Server, it is saved as two bytes (generally Unico encoding), and an English character is saved to the database. If the field type is varchar, only one byte is occupied, if the field type

Varchar uses a single byte to store data in SQL Server. nvarchar uses Unico to store data. when a Chinese character is stored in SQL Server, it is saved as two bytes (generally Unico encoding), and an English character is saved to the database. If the field type is varchar, only one byte is occupied, if the field type

Data Types of fixed-length (char) and variable-length (varchar) characters Char [(n)] Character data with a fixed length of n Bytes and is not Unicode. N must be a value between 1 and 8,000. The storage size is n Bytes. The synonym for char in the SQL-92 is character. Varchar [(n)] Variable-length and non-UNICODE character data with a length of n By

Conversion: differences between char, varchar, text, nchar, nvarchar, and ntext in SQL Server Many developers often do not consider the char and varchar types when designing databases. Some developers do not pay attention to them because the storage price is getting cheaper and cheaper, I forgot some of the basic design theories and principles at the beg

This article is from the 51cto blog (cannot stop V) Varchar uses a single byte to store data in SQL Server. nvarchar uses Unico to store data. when a Chinese character is stored in SQL Server, it is saved as two bytes (generally Unico encoding), and an English character is saved to the database. If the field type is varchar