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 varchar field accounts for 2x2+6=10 bytes of storage, while the nvarchar field accounts for 8x2=16 bytes of storage space.
If the field value is only English can choose varchar, and the field value exists more double-byte (Chinese, Korean, etc.) characters with nvarchar
Above is a summary of the introduction, through the above introduction, you can know.
varchar (4) You can enter 4 characters or two characters
nvarchar (4) can lose four characters, can also lose 4 letters, but a maximum of four
What is the difference between varchar and nvarchar in SQL?
