Difference between different string types in SQL Server?

Question

What is the difference between char, nchar, ntext, nvarchar, text and varchar in SQL?

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Answer 1

Text is deprecated.

Char is a set value. When you say char(10), you are reserving 10 characters for every single row, whether they are used or not. Use this for something that shouldn't change lengths (For example, Zip Code or SSN)

varchar is variable. When you say varchar(10), 2 bytes is set aside to store the size of the data, as well as the actual data (which might be only say, four bytes).

The N represents uni-code. Twice the space.