look this:
LEN (T-SQL)
Returns the number of characters, rather than the number of bytes, of the given string expression, excluding trailing blanks.
Syntax
LEN(string_expression)
Arguments
string_expression
Is the string expression to be evaluated.
Return Types
int
Examples
This example selects the number of characters and the data in CompanyName for companies located in Finland.
USE Northwind
GO
SELECT LEN(CompanyName) AS 'Length', CompanyName
FROM Customers
WHERE Country = 'Finland'
Here is the result set.
Length CompanyName
----------- ------------------------------
14 Wartian Herkku
11 Wilman Kala