SQL Server NCHAR
nchar [ (n) ] Fixed-size string data. n defines the string size in byte-pairs and must be a value from 1 through 4, The storage size is two times n bytes. For UCS-2 encoding, the storage size is two times n bytes and the number of characters that can be stored is also n. Definition and Usage The NCHAR () function returns the Unicode character based on the number code.
A database has a vast collection of data stored in an organized format. A database what is nchar in sql contain a variety of data values stored in it.
To avoid confusions, the data values are assigned a name based on its type. These are called datatypes. Datatypes help the what boyfriends should do for their girlfriends distinguish between different categories of data.
MS SQL Server supports a wide range of datatypes for the users to be able to easily identify various categories of data and to use it accordingly. Char : A character is a string of words dentod by single quotation marks. It is a datatype that stores only non-unicode data. It takes 1 byte of data and the maximum storage capacity is of bytes. It takes up two bytes to store the data and can store upto chars. Unicode data refers to a universal coding standard for letters and other data.
Each one is uniquely identified by designating a numeric value. Syntax —. Skip to content. Related Articles. Last Updated : 14 Sep, Next Difference between Virus and Adware. Recommended Articles. Article Contributed By :. Easy Normal Medium Hard Expert. Most popular in Difference Between. Most visited ncyar SQL.
What does N mean in SQL Server
4 rows · SQL Server NCHAR. Summary: in this tutorial, you will learn how to use the SQL Server NCHAR data. The SQL NCHAR function is a SQL String Function used to return the Unicode character at the specified integer value, as defined in Unicode standards. The syntax of the SQL Server UNICODE Function is SELECT NCHAR (Integer_Expression) FROM [Source] Integer_Expression: Please specify the valid numeric value. nchar & nvarchar (nvarchar(max)) are the Unicode string data types in SQL Server. They are similar to char & varchar but stores the strings in Unicode encoding. nchar is a fixed width data type while nvarchar is a variable-length dataType. In this tutorial, we will learn .
Also, learn similarities and differences between them. We need to convert the characters to binary so that they can be stored on a computer. To do that we need to give a binary code to all the possible characters. The numbers 0 to 9 were represented using the code 48 to 57 binary numbers. But, the ASCII with only distinct combinations was insufficient to represent the characters from other languages.
This problem was fixed using the code pages, but it was created new problems. This required a new way to encode the data. This is where Unicode comes into the picture. The Unicode system has binary code for all the characters of all the languages of the world. In Unicode, you can choose between 32, 16, or 8-bit encodings. The more bits you choose, the more languages you can support. The lower bit encodings will support a smaller subset of languages but save a lot of space.
Instead, use the nvarchar max. The syntax for declaring nchar variable is nchar n , where n defines the string size in byte-pairs. The value of n must be from 1 through 4, Note that n is string size in byte-pairs and not the number of characters or number of bytes.
A byte-pair equivalent to 2 bytes. The number of characters that you can store is n if the UCS-2 encoding is used. But if UTF encoding is used, then the number of characters that you can store is less than n. The syntax for declaring the nvarchar variable is nvarchar n , where n defines the string size in byte-pairs. The value of n must be from 1 through The extra 2 bytes to store the length information of the string. Unlike the nchar data type, nvarchar does not pad the string with blank spaces.
Hence the data stored in the nvarchar column always occupies only the number of bytes that are needed to store the string. Hence nvarchar is more storage efficient than the nchar strings. For Multibyte character sets such as Japanese or Chinese, the number of characters is less than n characters. The SQL Server stores data in units of pages. Page size is 8 KB or bytes. Out of which bytes the data is used to metadata information related to the page header, row offset, etc.
That leaves us bytes to store the data. Since column data cannot exceed a page otherwise it will be part of two pages , the maximum size you can use for a column is bytes.
But in the case of nvarchar max , the SQL server checks if the size of the string. If it is less than bytes then it stores it in the page itself. In this way, nvarchar max columns can store data up to 2 GB.
This data type is similar to nvarchar max and will be removed from the future version of SQL Server. Hence use nvarchar max instead. Without N prefix, the the string is interpreted as non Unicode. As you can see from the result, although the number of characters is 7, the size differs. So in disk nvarchar 10 column actually uses the 16 bytes i. This table characters mainly from English and also from a few other european languages like Spanish, Italian, etc. This site uses Akismet to reduce spam.
The syntax is nvarchar n where n is the maximum number of string size in byte-pairs 2 bytes to use. If the string length is less than the size of the column then the char adds trailing spaces to the data. The additional 2 bytes to store length information. Performance is slower compared to the nchar as the SQL Server needs to calculate the size of the string.
The number of characters you can store in a nchar n is n characters if a single-byte character set is used, which is the default in SQL Server. The number of characters you can store in a nvarchar n is n characters if a single-byte character set is used, which is the default in SQL Server. In such cases, the maximum storage size in bytes will remain as n. But the number of characters that can be stored may be smaller than n.
But in such situations, it is better to use nvarchar. Maybe more depending on the Unicode encoding used.