Difference between Varchar and Nvarchar

Key Difference: In SQL server, both refer to data types. Varchar stands for variable length character string. Varchar stores ASCII data, whereas Nvarchar stores UNICODE data.

Data types play an important role in describing the form of data. It is useful for the storage of data. Two such data types are varchar and nvarchar. Varchar stands for variable length character string. Varchar basically occupies the number of bytes equal to the number of characters that are stored in the column. Varchar is used when non-Unicode characters are to be stored. It allocates the memory depending upon the number of inserted characters. For example, varchar(30) will initially allocate memory of zero characters during the declaration time. However, let us assume that only 20 characters are inserted, then in that case, the memory will be allocated to only those 20 characters.

Nvarchar is quiet the same as varchar. However, it is used to store Unicode characters, and thus one is able to store multiple languages in database. Nvarchar is preferred over varchar, as it does not require encoding conversions for reading from or writing to the database every time. On the other hand, conversions take time and are prone to errors. However, one should only use nvarchar if there is a need to store the data of different languages that is collation which requires two bytes to store a single character.

Comparison between Varchar and Nvarchar in Sql Server:

 

Varchar(n)

Nvarchar(n)

Definition

Varchar stores ASCII data

Nvarchar stores UNICODE data.

 

Number of bytes for each character

1

2

Optional Parameter n range

Optional Parameter n value can be from 1 to 8000.Can store maximum 8000 Non-Unicode characters.

Optional Parameter n value can be from 1 to 4000.Can store maximum 4000 Unicode/Non-Unicode characters

Storage

Maximum 8000 Non-Unicode characters

Maximum 4000 Unicode/Non-Unicode characters.

Code page

Different types of code pages

Unicode universal code page

Memory saving

Fifty percent memory space is saved more, than in comparison to nvarchar

Less memory saved comparatively.

Query execution

Fast

Comparatively slow

Image Courtesy: netbeans.org, msdn.microsoft.com

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