NVarchar（MAX）用于短字符串

Question

I am interested is NVarchar(MAX) a good data type is I want to store short unicode strings which are 1-50 characters long, but most of them (more than 90%) are 5-10 characters long?

The column will not be used in comparison and ordering queries. It might be added to index as included column. Expected rows count - more than 10M.

Any recommendations? Thank you in advance!

Answer 1

Why would you use nvarchar(MAX) for such short strings? If you know the maximum length is 50 characters, make it nvarchar(50).

Also, I do not believe an nvarchar(MAX) column can be included in an index as it would break the 900 byte limit.

Answer 2

我建议如果最大长度确实是50，则nvarchar（50）更合适。

Answer 3

NVARCHAR(MAX) (which I believe is the same as NTEXT in the earlier versions of SQL server) is intended for storing long text values of variable and potentially unlimited length.

If you know the values won't exceed N characters, you should use NVARCHAR(N).