How to get the size of a varchar[n] field in one SQL statement?

Question

Suppose that I have a SQL table that has a varchar[1000] field called \"Remarks\".

I would like to craft a single SQL statement, which when executed, will return 100

Answer 1

select column_name, data_type, character_maximum_length    
from INFORMATION_SCHEMA.COLUMNS
where table_name = 'Table1'

Answer 2

For SQL Server (2008 and above):

SELECT COLUMNPROPERTY(OBJECT_ID('mytable'), 'Remarks', 'PRECISION');

COLUMNPROPERTY returns information for a column or parameter (id, column/parameter, property). The PRECISION property returns the length of the data type of the column or parameter.

COLUMNPROPERTY documentation