The difference between nvarchar and varchar

1、varchar yes Not Unicode Variable length type ,nvarchar yes Unicode Variable length type .

2、varchar and nvarchar The maximum length of is different ,nvarchar The length of must be set to 1 and 4000 Between .varchar The length setting of must be 1 and 8000 Between .

3、varchar The number of bytes that can be stored is its length .nvarchar The number of bytes that can be stored is of its length 2 times .

difference ：

① From the storage mode ,nvarchar Is in accordance with the character Stored ,varchar Is in accordance with the byte Stored .

② In terms of storage ,varchar It saves space , Because the size of storage is the actual length of bytes , and nvarchar Double byte storage .

③ On use , If the stored content is English characters without Chinese characters or other languages , It is recommended to use varchar, The use of Chinese characters nvarchar, because nvarchar The use of Unicode code , Uniform coding , It will reduce the probability of garbled code .

summary ：

Today's devices , The size of storage space has been unlimited . Regardless of the scope of the language , And the range of storage space ,nvarchar Have a great advantage .

It is recommended to select..., as the database for the project nvarchar.

Link to the original text ：https://blog.csdn.net/Sunshineoe/article/details/111715231