please solved my problems.
This needs a LOT more information. Did you solve your problem, or do you need specific help with something?
What is the difference between varchar and nvarchar?
nvarchar deals with unicode data, varchar deals does not.
Nvarchar stores UNICODE data. If you have requirements to store UNICODE or multilingual data, nvarchar is the choice. Varchar stores ASCII data and should be your data type of choice for normal use. Regarding memory usage, nvarchar uses 2 bytes per character, whereas varchar uses 1.
Varchar is Non-Unicode Variable Length character data type.
NVarchar is UNicode Variable Length character data type. It can store both non-Unicode and Unicode characters.
Varchar takes 1 byte per character
NVarchar takes 2 bytes per Unicode/Non-Unicode character.
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